Startup Issue with Minecraft - Game will not start and it isn't generating crash reports

System Information

Field Value
Operating System Linux - Ubuntu 24.04.3 on x86_64
Product AMP ‘Phobos’ v2.6.4.2 (Mainline)
Virtualization None
Application Minecraft
Module MinecraftModule
Running in Container No
Current State Failed

Problem Description

Issue

at TRANSFORMER/minecraft@1.20.1/net.minecraft.commands.BrigadierExceptions.(BrigadierExceptions.java:24) this is one of the common logs but doesn’t seem to give more details.

main/WARN

22:51:04

Reference map 'cristellib-forge-refmap.json' for cristellib.mixins.json could not be read. If this is a development environment you can ignore this message

Reference map ‘mixins.luminous_halloween.refmap.json’ for mixins.luminous_halloween.json could not be read. If this is a development environment you can ignore this message

Reference map ‘integrated_cataclysm.refmap.json’ for integrated_cataclysm.mixins.json could not be read. If this is a development environment you can ignore this message

Reference map ‘trashslot.refmap.json’ for trashslot.mixins.json could not be read. If this is a development environment you can ignore this message

Reference map ‘mes-forge-refmap.json’ for mes-forge.mixins.json could not be read. If this is a development environment you can ignore this message

Reference map ‘coroutil.refmap.json’ for coroutil.mixins.json could not be read. If this is a development environment you can ignore this message

Reference map ‘moblassos.refmap.json’ for moblassos.common.mixins.json could not be read. If this is a development environment you can ignore this message

main/INFO

22:51:05

Patching IForgeItemStack#getEnchantmentLevel

Patching IForgeItemStack#getEnchantmentLevel

main/ERROR

22:51:05

Attempted to load class net/minecraft/client/MouseHandler for invalid dist DEDICATED_SERVER

main/WARN

22:51:05

Error loading class: net/minecraft/client/MouseHandler (java.lang.RuntimeException: Attempted to load class net/minecraft/client/MouseHandler for invalid dist DEDICATED_SERVER)

@Mixin target net.minecraft.client.MouseHandler was not found fabric-screen-api-v1.mixins.json:MouseMixin

main/ERROR

22:51:05

Attempted to load class net/minecraft/client/gui/screens/Screen for invalid dist DEDICATED_SERVER

main/WARN

22:51:05

Error loading class: net/minecraft/client/gui/screens/Screen (java.lang.RuntimeException: Attempted to load class net/minecraft/client/gui/screens/Screen for invalid dist DEDICATED_SERVER)

@Mixin target net.minecraft.client.gui.screens.Screen was not found fabric-screen-api-v1.mixins.json:ScreenAccessor

Error loading class: net/mehvahdjukaar/amendments/events/behaviors/InteractEvents (java.lang.ClassNotFoundException: net.mehvahdjukaar.amendments.events.behaviors.InteractEvents)

@Mixin target net.mehvahdjukaar.amendments.events.behaviors.InteractEvents was not found mynethersdelight.mixins.json:amendments.InteractEventsMixin

22:51:06

Error loading class: com/aetherteam/aether_genesis/world/GenesisRegion (java.lang.ClassNotFoundException: com.aetherteam.aether_genesis.world.GenesisRegion)

main/INFO

22:51:06

Loaded config for: structureessentials.json

main/ERROR

22:51:06

Attempted to load class net/minecraft/client/gui/screens/Screen for invalid dist DEDICATED_SERVER

main/WARN

22:51:06

Error loading class: net/minecraft/client/gui/screens/Screen (java.lang.RuntimeException: Attempted to load class net/minecraft/client/gui/screens/Screen for invalid dist DEDICATED_SERVER)

@Mixin target net.minecraft.client.gui.screens.Screen was not found relics.mixins.json:ScreenMixin

Error loading class: dev/tr7zw/skinlayers/render/CustomizableModelPart (java.lang.ClassNotFoundException: dev.tr7zw.skinlayers.render.CustomizableModelPart)

Error loading class: net/minecraft/client/model/geom/builders/LayerDefinition (java.lang.ClassNotFoundException: net.minecraft.client.model.geom.builders.LayerDefinition)

@Mixin target net.minecraft.client.model.geom.builders.LayerDefinition was not found aether_protect_your_moa.mixins.json:client.accessor.LayerDefinitionAccessor

Error loading class: com/aetherteam/aether_genesis/block/natural/GreenAercloudBlock (java.lang.ClassNotFoundException: com.aetherteam.aether_genesis.block.natural.GreenAercloudBlock)

@Mixin target com.aetherteam.aether_genesis.block.natural.GreenAercloudBlock was not found aether_redux.mixins.json:common.block.GreenAercloudBlockMixin

Error loading class: com/aetherteam/aether_genesis/block/natural/OrangeTreeBlock (java.lang.ClassNotFoundException: com.aetherteam.aether_genesis.block.natural.OrangeTreeBlock)

@Mixin target com.aetherteam.aether_genesis.block.natural.OrangeTreeBlock was not found aether_redux.mixins.json:common.block.OrangeTreeMixin

Error loading class: com/aetherteam/aether_genesis/block/natural/PurpleAercloudBlock (java.lang.ClassNotFoundException: com.aetherteam.aether_genesis.block.natural.PurpleAercloudBlock)

@Mixin target com.aetherteam.aether_genesis.block.natural.PurpleAercloudBlock was not found aether_redux.mixins.json:common.block.PurpleAercloudBlockMixin

Error loading class: net/minecraft/client/renderer/entity/PhantomRenderer (java.lang.ClassNotFoundException: net.minecraft.client.renderer.entity.PhantomRenderer)

@Mixin target net.minecraft.client.renderer.entity.PhantomRenderer was not found mixins.deeperdarker.json:PhantomRendererMixin

Error loading class: tschipp/carryon/common/carry/PickupHandler (java.lang.ClassNotFoundException: tschipp.carryon.common.carry.PickupHandler)

@Mixin target tschipp.carryon.common.carry.PickupHandler was not found fossil_forge.mixins.json:PickupHandlerMixin

Error loading class: vazkii/botania/common/item/equipment/armor/manasteel/ManasteelArmorItem (java.lang.ClassNotFoundException: vazkii.botania.common.item.equipment.armor.manasteel.ManasteelArmorItem)

@Mixin target vazkii.botania.common.item.equipment.armor.manasteel.ManasteelArmorItem was not found aether_gloves_for_all.mixins.json:ManasteelArmorItemMixin

Error loading class: blusunrize/immersiveengineering/api/wires/GlobalWireNetwork (java.lang.ClassNotFoundException: blusunrize.immersiveengineering.api.wires.GlobalWireNetwork)

@Mixin target blusunrize.immersiveengineering.api.wires.GlobalWireNetwork was not found mixins.epp.json:MixinGlobalWireNetwork

Error loading class: net/darkhax/darkutils/features/charms/CharmEffects (java.lang.ClassNotFoundException: net.darkhax.darkutils.features.charms.CharmEffects)

Error loading class: com/brandon3055/csg/ModEventHandler (java.lang.ClassNotFoundException: com.brandon3055.csg.ModEventHandler)

Error loading class: vazkii/quark/content/tweaks/module/AutomaticRecipeUnlockModule (java.lang.ClassNotFoundException: vazkii.quark.content.tweaks.module.AutomaticRecipeUnlockModule)

main/ERROR

22:51:06

Attempted to load class com/mojang/blaze3d/vertex/BufferBuilder$RenderedBuffer for invalid dist DEDICATED_SERVER

main/WARN

22:51:06

Error loading class: com/mojang/blaze3d/vertex/BufferBuilder$RenderedBuffer (java.lang.RuntimeException: Attempted to load class com/mojang/blaze3d/vertex/BufferBuilder$RenderedBuffer for invalid dist DEDICATED_SERVER)

main/ERROR

22:51:06

Attempted to load class com/mojang/blaze3d/vertex/BufferBuilder$RenderedBuffer for invalid dist DEDICATED_SERVER

main/WARN

22:51:06

Error loading class: com/mojang/blaze3d/vertex/BufferBuilder$RenderedBuffer (java.lang.RuntimeException: Attempted to load class com/mojang/blaze3d/vertex/BufferBuilder$RenderedBuffer for invalid dist DEDICATED_SERVER)

main/ERROR

22:51:07

Attempted to load class com/mojang/blaze3d/vertex/PoseStack$Pose for invalid dist DEDICATED_SERVER

main/WARN

22:51:07

Error loading class: com/mojang/blaze3d/vertex/PoseStack$Pose (java.lang.RuntimeException: Attempted to load class com/mojang/blaze3d/vertex/PoseStack$Pose for invalid dist DEDICATED_SERVER)

Error loading class: com/mojang/blaze3d/platform/InputConstants$Key (java.lang.ClassNotFoundException: com.mojang.blaze3d.platform.InputConstants$Key)

main/INFO

22:51:07

Initializing MixinExtras via com.llamalad7.mixinextras.service.MixinExtrasServiceImpl(version=0.5.0).

[java.lang.ThreadGroup:uncaughtException:1077]: at MC-BOOTSTRAP/cpw.mods.modlauncher@10.0.9/cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:71)

[java.lang.ThreadGroup:uncaughtException:1077]: at MC-BOOTSTRAP/cpw.mods.modlauncher@10.0.9/cpw.mods.modlauncher.Launcher.run(Launcher.java:108)

[java.lang.ThreadGroup:uncaughtException:1077]: at MC-BOOTSTRAP/cpw.mods.modlauncher@10.0.9/cpw.mods.modlauncher.Launcher.main(Launcher.java:78)

[java.lang.ThreadGroup:uncaughtException:1077]: at MC-BOOTSTRAP/cpw.mods.modlauncher@10.0.9/cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:26)

[java.lang.ThreadGroup:uncaughtException:1077]: at MC-BOOTSTRAP/cpw.mods.modlauncher@10.0.9/cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:23)

[java.lang.ThreadGroup:uncaughtException:1077]: at cpw.mods.bootstraplauncher@1.1.2/cpw.mods.bootstraplauncher.BootstrapLauncher.main(BootstrapLauncher.java:141)

[java.lang.ThreadGroup:uncaughtException:1086]: Caused by: java.lang.reflect.InvocationTargetException

[java.lang.ThreadGroup:uncaughtException:1086]: at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

[java.lang.ThreadGroup:uncaughtException:1086]: at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)

[java.lang.ThreadGroup:uncaughtException:1086]: at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

[java.lang.ThreadGroup:uncaughtException:1086]: at java.base/java.lang.reflect.Method.invoke(Method.java:569)

[java.lang.ThreadGroup:uncaughtException:1086]: at MC-BOOTSTRAP/fmlloader@1.20.1-47.4.10/net.minecraftforge.fml.loading.targets.CommonLaunchHandler.runTarget(CommonLaunchHandler.java:111)

[java.lang.ThreadGroup:uncaughtException:1086]: at MC-BOOTSTRAP/fmlloader@1.20.1-47.4.10/net.minecraftforge.fml.loading.targets.CommonLaunchHandler.serverService(CommonLaunchHandler.java:103)

[java.lang.ThreadGroup:uncaughtException:1086]: at MC-BOOTSTRAP/fmlloader@1.20.1-47.4.10/net.minecraftforge.fml.loading.targets.CommonServerLaunchHandler.lambda$makeService$0(CommonServerLaunchHandler.java:27)

[java.lang.ThreadGroup:uncaughtException:1086]: at MC-BOOTSTRAP/cpw.mods.modlauncher@10.0.9/cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:30)

[java.lang.ThreadGroup:uncaughtException:1086]: … 7 more

[java.lang.Throwable:printStackTrace:659]: Caused by: java.lang.ExceptionInInitializerError

[java.lang.Throwable:printStackTrace:659]: at TRANSFORMER/minecraft@1.20.1/net.minecraft.network.chat.MutableComponent.m_237204_(MutableComponent.java:29)

[java.lang.Throwable:printStackTrace:659]: at TRANSFORMER/minecraft@1.20.1/net.minecraft.network.chat.Component.m_237115_(Component.java:444)

[java.lang.Throwable:printStackTrace:659]: at TRANSFORMER/minecraft@1.20.1/net.minecraft.commands.BrigadierExceptions.(BrigadierExceptions.java:24)

[java.lang.Throwable:printStackTrace:659]: at TRANSFORMER/minecraft@1.20.1/net.minecraft.SharedConstants.(SharedConstants.java:216)

[java.lang.Throwable:printStackTrace:659]: at TRANSFORMER/minecraft@1.20.1/net.minecraft.server.Main.main(Main.java:69)

[java.lang.Throwable:printStackTrace:659]: … 15 more

[java.lang.Throwable:printStackTrace:682]: Caused by: java.lang.RuntimeException: Attempted to load class net/minecraft/client/gui/screens/Screen for invalid dist DEDICATED_SERVER

[java.lang.Throwable:printStackTrace:682]: at MC-BOOTSTRAP/fmlloader@1.20.1-47.4.10/net.minecraftforge.fml.loading.RuntimeDistCleaner.processClassWithFlags(RuntimeDistCleaner.java:57)

[java.lang.Throwable:printStackTrace:682]: at MC-BOOTSTRAP/cpw.mods.modlauncher@10.0.9/cpw.mods.modlauncher.LaunchPluginHandler.offerClassNodeToPlugins(LaunchPluginHandler.java:88)

[java.lang.Throwable:printStackTrace:682]: at MC-BOOTSTRAP/cpw.mods.modlauncher@10.0.9/cpw.mods.modlauncher.ClassTransformer.transform(ClassTransformer.java:120)

[java.lang.Throwable:printStackTrace:682]: at MC-BOOTSTRAP/cpw.mods.modlauncher@10.0.9/cpw.mods.modlauncher.TransformingClassLoader.maybeTransformClassBytes(TransformingClassLoader.java:50)

[java.lang.Throwable:printStackTrace:682]: at cpw.mods.securejarhandler/cpw.mods.cl.ModuleClassLoader.readerToClass(ModuleClassLoader.java:113)

[java.lang.Throwable:printStackTrace:682]: at cpw.mods.securejarhandler/cpw.mods.cl.ModuleClassLoader.lambda$findClass$15(ModuleClassLoader.java:219)

[java.lang.Throwable:printStackTrace:682]: at cpw.mods.securejarhandler/cpw.mods.cl.ModuleClassLoader.loadFromModule(ModuleClassLoader.java:229)

[java.lang.Throwable:printStackTrace:682]: at cpw.mods.securejarhandler/cpw.mods.cl.ModuleClassLoader.findClass(ModuleClassLoader.java:219)

[java.lang.Throwable:printStackTrace:682]: at cpw.mods.securejarhandler/cpw.mods.cl.ModuleClassLoader.loadClass(ModuleClassLoader.java:135)

[java.lang.Throwable:printStackTrace:682]: at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:525)

[java.lang.Throwable:printStackTrace:682]: at TRANSFORMER/minecraft@1.20.1/net.minecraft.resources.ResourceLocation.handler$cjh000$etf$illegalPathOverride(ResourceLocation.java:525)

[java.lang.Throwable:printStackTrace:682]: at TRANSFORMER/minecraft@1.20.1/net.minecraft.resources.ResourceLocation.m_135841_(ResourceLocation.java:206)

[java.lang.Throwable:printStackTrace:682]: at TRANSFORMER/minecraft@1.20.1/net.minecraft.resources.ResourceLocation.m_245185_(ResourceLocation.java:241)

[java.lang.Throwable:printStackTrace:682]: at TRANSFORMER/minecraft@1.20.1/net.minecraft.resources.ResourceLocation.(ResourceLocation.java:40)

[java.lang.Throwable:printStackTrace:682]: at TRANSFORMER/minecraft@1.20.1/net.minecraft.network.chat.Style.(Style.java:39)

[java.lang.Throwable:printStackTrace:682]: … 20 more

Console

22:51:08

Exception in thread "main" 

Reproduction Steps

  • Press start to start server.
  • wait for server to load and go through its setup
  • server doesn’t load

Mind sharing the logs/latest.log with https://mclo.gs/ ?

What next? gave me 56 errors i don’t understand

| [19Dec2025 04:51:03.141] [main/ERROR] [mixin/]: Mixin config uniqueaccessories.mixins.json does not specify “minVersion” property
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|----|
| | [19Dec2025 04:51:03.271] [main/ERROR] [mixin/]: Mixin config fabric-item-group-api-v1.mixins.json does not specify “minVersion” property
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| | [19Dec2025 04:51:03.274] [main/ERROR] [mixin/]: Mixin config fabric-item-group-api-v1.client.mixins.json does not specify “minVersion” property
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| | [19Dec2025 04:51:03.342] [main/ERROR] [mixin/]: Mixin config fabric-item-api-v1.client.mixins.json does not specify “minVersion” property
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| | [19Dec2025 04:51:03.374] [main/ERROR] [mixin/]: Mixin config fabric-data-attachment-api-v1.mixins.json does not specify “minVersion” property
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| | [19Dec2025 04:51:03.375] [main/ERROR] [mixin/]: Mixin config fabric-data-attachment-api-v1.client.mixins.json does not specify “minVersion” property
|
| | 370 lines |
| | [19Dec2025 04:51:05.411] [main/ERROR] [net.minecraftforge.fml.loading.RuntimeDistCleaner/DISTXFORM]: Attempted to load class net/minecraft/client/MouseHandler for invalid dist DEDICATED_SERVER
|
| | 2 lines |
| | [19Dec2025 04:51:05.413] [main/ERROR] [net.minecraftforge.fml.loading.RuntimeDistCleaner/DISTXFORM]: Attempted to load class net/minecraft/client/gui/screens/Screen for invalid dist DEDICATED_SERVER
|
| | 6 lines |
| | [19Dec2025 04:51:06.165] [main/ERROR] [net.minecraftforge.fml.loading.RuntimeDistCleaner/DISTXFORM]: Attempted to load class net/minecraft/client/gui/screens/Screen for invalid dist DEDICATED_SERVER
|
| | 22 lines |
| | [19Dec2025 04:51:06.966] [main/ERROR] [net.minecraftforge.fml.loading.RuntimeDistCleaner/DISTXFORM]: Attempted to load class com/mojang/blaze3d/vertex/BufferBuilder$RenderedBuffer for invalid dist DEDICATED_SERVER
|
| | 1 line |
| | [19Dec2025 04:51:06.967] [main/ERROR] [net.minecraftforge.fml.loading.RuntimeDistCleaner/DISTXFORM]: Attempted to load class com/mojang/blaze3d/vertex/BufferBuilder$RenderedBuffer for invalid dist DEDICATED_SERVER
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| | 1 line |
| | [19Dec2025 04:51:07.084] [main/ERROR] [net.minecraftforge.fml.loading.RuntimeDistCleaner/DISTXFORM]: Attempted to load class com/mojang/blaze3d/vertex/PoseStack$Pose for invalid dist DEDICATED_SERVER
|
| | 3 lines |
| | [19Dec2025 04:51:07.732] [main/ERROR] [net.minecraftforge.fml.loading.RuntimeDistCleaner/DISTXFORM]: Attempted to load class net/minecraft/client/gui/screens/Screen for invalid dist DEDICATED_SERVER
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| | [19Dec2025 04:51:07.734] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1077]: java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
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| | [19Dec2025 04:51:07.734] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1077]: at MC-BOOTSTRAP/cpw.mods.modlauncher@10.0.9/cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:32)
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| | [19Dec2025 04:51:07.734] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1077]: at MC-BOOTSTRAP/cpw.mods.modlauncher@10.0.9/cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:53)
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| | [19Dec2025 04:51:07.734] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1077]: at MC-BOOTSTRAP/cpw.mods.modlauncher@10.0.9/cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:71)
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| | [19Dec2025 04:51:07.734] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1077]: at MC-BOOTSTRAP/cpw.mods.modlauncher@10.0.9/cpw.mods.modlauncher.Launcher.run(Launcher.java:108)
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| | [19Dec2025 04:51:07.734] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1077]: at MC-BOOTSTRAP/cpw.mods.modlauncher@10.0.9/cpw.mods.modlauncher.Launcher.main(Launcher.java:78)
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| | [19Dec2025 04:51:07.734] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1077]: at MC-BOOTSTRAP/cpw.mods.modlauncher@10.0.9/cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:26)
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| | [19Dec2025 04:51:07.734] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1077]: at MC-BOOTSTRAP/cpw.mods.modlauncher@10.0.9/cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:23)
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| | [19Dec2025 04:51:07.734] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1077]: at cpw.mods.bootstraplauncher@1.1.2/cpw.mods.bootstraplauncher.BootstrapLauncher.main(BootstrapLauncher.java:141)
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| | [19Dec2025 04:51:07.735] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1086]: Caused by: java.lang.reflect.InvocationTargetException
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| | [19Dec2025 04:51:07.735] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1086]: at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
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| | [19Dec2025 04:51:07.735] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1086]: at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
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| | [19Dec2025 04:51:07.735] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1086]: at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
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| | [19Dec2025 04:51:07.735] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1086]: at java.base/java.lang.reflect.Method.invoke(Method.java:569)
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| | [19Dec2025 04:51:07.735] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1086]: at MC-BOOTSTRAP/fmlloader@1.20.1-47.4.10/net.minecraftforge.fml.loading.targets.CommonLaunchHandler.runTarget(CommonLaunchHandler.java:111)
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| | [19Dec2025 04:51:07.735] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1086]: at MC-BOOTSTRAP/fmlloader@1.20.1-47.4.10/net.minecraftforge.fml.loading.targets.CommonLaunchHandler.serverService(CommonLaunchHandler.java:103)
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| | [19Dec2025 04:51:07.735] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1086]: at MC-BOOTSTRAP/fmlloader@1.20.1-47.4.10/net.minecraftforge.fml.loading.targets.CommonServerLaunchHandler.lambda$makeService$0(CommonServerLaunchHandler.java:27)
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| | [19Dec2025 04:51:07.735] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1086]: at MC-BOOTSTRAP/cpw.mods.modlauncher@10.0.9/cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:30)
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| | [19Dec2025 04:51:07.736] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1086]: … 7 more
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| | [19Dec2025 04:51:07.736] [main/INFO] [STDERR/]: [java.lang.Throwable:printStackTrace:659]: Caused by: java.lang.ExceptionInInitializerError
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| | [19Dec2025 04:51:07.736] [main/INFO] [STDERR/]: [java.lang.Throwable:printStackTrace:659]: at TRANSFORMER/minecraft@1.20.1/net.minecraft.network.chat.MutableComponent.m_237204_(MutableComponent.java:29)
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| | [19Dec2025 04:51:07.736] [main/INFO] [STDERR/]: [java.lang.Throwable:printStackTrace:659]: at TRANSFORMER/minecraft@1.20.1/net.minecraft.network.chat.Component.m_237115_(Component.java:444)
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| | [19Dec2025 04:51:07.736] [main/INFO] [STDERR/]: [java.lang.Throwable:printStackTrace:659]: at TRANSFORMER/minecraft@1.20.1/net.minecraft.commands.BrigadierExceptions.(BrigadierExceptions.java:24)
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| | [19Dec2025 04:51:07.736] [main/INFO] [STDERR/]: [java.lang.Throwable:printStackTrace:659]: at TRANSFORMER/minecraft@1.20.1/net.minecraft.SharedConstants.(SharedConstants.java:216)
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| | [19Dec2025 04:51:07.736] [main/INFO] [STDERR/]: [java.lang.Throwable:printStackTrace:659]: at TRANSFORMER/minecraft@1.20.1/net.minecraft.server.Main.main(Main.java:69)
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| | [19Dec2025 04:51:07.736] [main/INFO] [STDERR/]: [java.lang.Throwable:printStackTrace:659]: … 15 more
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| | [19Dec2025 04:51:07.736] [main/INFO] [STDERR/]: [java.lang.Throwable:printStackTrace:682]: Caused by: java.lang.RuntimeException: Attempted to load class net/minecraft/client/gui/screens/Screen for invalid dist DEDICATED_SERVER
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| | [19Dec2025 04:51:07.736] [main/INFO] [STDERR/]: [java.lang.Throwable:printStackTrace:682]: at MC-BOOTSTRAP/fmlloader@1.20.1-47.4.10/net.minecraftforge.fml.loading.RuntimeDistCleaner.processClassWithFlags(RuntimeDistCleaner.java:57)
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| | [19Dec2025 04:51:07.737] [main/INFO] [STDERR/]: [java.lang.Throwable:printStackTrace:682]: at MC-BOOTSTRAP/cpw.mods.modlauncher@10.0.9/cpw.mods.modlauncher.LaunchPluginHandler.offerClassNodeToPlugins(LaunchPluginHandler.java:88)
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| | [19Dec2025 04:51:07.737] [main/INFO] [STDERR/]: [java.lang.Throwable:printStackTrace:682]: at MC-BOOTSTRAP/cpw.mods.modlauncher@10.0.9/cpw.mods.modlauncher.ClassTransformer.transform(ClassTransformer.java:120)
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| | [19Dec2025 04:51:07.737] [main/INFO] [STDERR/]: [java.lang.Throwable:printStackTrace:682]: at MC-BOOTSTRAP/cpw.mods.modlauncher@10.0.9/cpw.mods.modlauncher.TransformingClassLoader.maybeTransformClassBytes(TransformingClassLoader.java:50)
|
| | [19Dec2025 04:51:07.737] [main/INFO] [STDERR/]: [java.lang.Throwable:printStackTrace:682]: at cpw.mods.securejarhandler/cpw.mods.cl.ModuleClassLoader.readerToClass(ModuleClassLoader.java:113)
|
| | [19Dec2025 04:51:07.737] [main/INFO] [STDERR/]: [java.lang.Throwable:printStackTrace:682]: at cpw.mods.securejarhandler/cpw.mods.cl.ModuleClassLoader.lambda$findClass$15(ModuleClassLoader.java:219)
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| | [19Dec2025 04:51:07.737] [main/INFO] [STDERR/]: [java.lang.Throwable:printStackTrace:682]: at cpw.mods.securejarhandler/cpw.mods.cl.ModuleClassLoader.loadFromModule(ModuleClassLoader.java:229)
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| | [19Dec2025 04:51:07.737] [main/INFO] [STDERR/]: [java.lang.Throwable:printStackTrace:682]: at cpw.mods.securejarhandler/cpw.mods.cl.ModuleClassLoader.findClass(ModuleClassLoader.java:219)
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| | [19Dec2025 04:51:07.737] [main/INFO] [STDERR/]: [java.lang.Throwable:printStackTrace:682]: at cpw.mods.securejarhandler/cpw.mods.cl.ModuleClassLoader.loadClass(ModuleClassLoader.java:135)
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| | [19Dec2025 04:51:07.737] [main/INFO] [STDERR/]: [java.lang.Throwable:printStackTrace:682]: at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:525)
|
| | [19Dec2025 04:51:07.737] [main/INFO] [STDERR/]: [java.lang.Throwable:printStackTrace:682]: at TRANSFORMER/minecraft@1.20.1/net.minecraft.resources.ResourceLocation.handler$cjh000$etf$illegalPathOverride(ResourceLocation.java:525)
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| | [19Dec2025 04:51:07.737] [main/INFO] [STDERR/]: [java.lang.Throwable:printStackTrace:682]: at TRANSFORMER/minecraft@1.20.1/net.minecraft.resources.ResourceLocation.m_135841_(ResourceLocation.java:206)
|
| | [19Dec2025 04:51:07.737] [main/INFO] [STDERR/]: [java.lang.Throwable:printStackTrace:682]: at TRANSFORMER/minecraft@1.20.1/net.minecraft.resources.ResourceLocation.m_245185_(ResourceLocation.java:241)
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| | [19Dec2025 04:51:07.738] [main/INFO] [STDERR/]: [java.lang.Throwable:printStackTrace:682]: at TRANSFORMER/minecraft@1.20.1/net.minecraft.resources.ResourceLocation.(ResourceLocation.java:40)
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| | [19Dec2025 04:51:07.738] [main/INFO] [STDERR/]: [java.lang.Throwable:printStackTrace:682]: at TRANSFORMER/minecraft@1.20.1/net.minecraft.network.chat.Style.(Style.java:39)
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| | [19Dec2025 04:51:07.738] [main/INFO] [STDERR/]: [java.lang.Throwable:printStackTrace:682]: … 20 more |

Make sure you have Java 17 selected under Java and Memory.
If that checks out please share the full log using the site I linked.

Hello I am having a similar problem too. Where can I share you my log?

Here is my log Forge 1.20.1 Server Log [#dWwlvo0] - mclo.gs

Make your own post please