New Minecraft Paper 1.21.0 Instance dont start

Rene_Bachtroegl · 7 November 2025 19:16

OS Name/Version: Ubuntu 24.04

Product Name/Version: AMP Release “Phobos” v2.6.3.2, built 22/10/2025 11:11

Problem Description:

A new Minecraft instance Paper 1.21.0 dont start

Console20:05:34
Starting org.bukkit.craftbukkit.Main
*** Warning, you've not updated in a while! ***
*** Please download a new build as per instructions from https://papermc.io/downloads/paper ***
System Info: Java 21 (OpenJDK 64-Bit Server VM 21.0.7+6-LTS) Host: Linux 6.8.0-71-generic (amd64)
Loading libraries, please wait...
INFO20:05:39
Environment: authHost='https://authserver.mojang.com', accountsHost='https://api.mojang.com', sessionHost='https://sessionserver.mojang.com', servicesHost='https://api.minecraftservices.com', name='PROD'
20:05:40
Loaded 7 recipes
20:05:41
Using epoll channel type
Paper: Using libdeflate (Linux x86_64) compression from Velocity.
Paper: Using OpenSSL 3.0.x (Linux x86_64) cipher from Velocity.
Server permissions file permissions.yml is empty, ignoring it
Preparing level "world"
ERROR20:05:41
Failed to load random sequence sequences
Console20:05:41
java.util.NoSuchElementException: No value present
	at java.util.Optional.get(Optional.java:143) ~[?:?]
	at net.minecraft.world.RandomSequences.load(RandomSequences.java:103) ~[paper-1.20.jar:git-Paper-17]
	at net.minecraft.server.level.ServerLevel.lambda$new$9(ServerLevel.java:726) ~[?:?]
	at net.minecraft.world.level.storage.DimensionDataStorage.readSavedData(DimensionDataStorage.java:66) ~[?:?]
	at net.minecraft.world.level.storage.DimensionDataStorage.get(DimensionDataStorage.java:53) ~[?:?]
	at net.minecraft.world.level.storage.DimensionDataStorage.computeIfAbsent(DimensionDataStorage.java:39) ~[?:?]
	at net.minecraft.server.level.ServerLevel.lambda$new$11(ServerLevel.java:725) ~[?:?]
	at java.util.Objects.requireNonNullElseGet(Objects.java:334) ~[?:?]
	at net.minecraft.server.level.ServerLevel.<init>(ServerLevel.java:724) ~[?:?]
	at net.minecraft.server.MinecraftServer.loadWorld0(MinecraftServer.java:586) ~[paper-1.20.jar:git-Paper-17]
	at net.minecraft.server.MinecraftServer.loadLevel(MinecraftServer.java:435) ~[paper-1.20.jar:git-Paper-17]
	at net.minecraft.server.dedicated.DedicatedServer.initServer(DedicatedServer.java:308) ~[paper-1.20.jar:git-Paper-17]
	at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1101) ~[paper-1.20.jar:git-Paper-17]
	at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:318) ~[paper-1.20.jar:git-Paper-17]
	at java.lang.Thread.run(Thread.java:1583) ~[?:?]
ERROR20:05:41
Failed to load random sequence salt
Console20:05:41
java.util.NoSuchElementException: No value present
	at java.util.Optional.get(Optional.java:143) ~[?:?]
	at net.minecraft.world.RandomSequences.load(RandomSequences.java:103) ~[paper-1.20.jar:git-Paper-17]
	at net.minecraft.server.level.ServerLevel.lambda$new$9(ServerLevel.java:726) ~[?:?]
	at net.minecraft.world.level.storage.DimensionDataStorage.readSavedData(DimensionDataStorage.java:66) ~[?:?]
	at net.minecraft.world.level.storage.DimensionDataStorage.get(DimensionDataStorage.java:53) ~[?:?]
	at net.minecraft.world.level.storage.DimensionDataStorage.computeIfAbsent(DimensionDataStorage.java:39) ~[?:?]
	at net.minecraft.server.level.ServerLevel.lambda$new$11(ServerLevel.java:725) ~[?:?]
	at java.util.Objects.requireNonNullElseGet(Objects.java:334) ~[?:?]
	at net.minecraft.server.level.ServerLevel.<init>(ServerLevel.java:724) ~[?:?]
	at net.minecraft.server.MinecraftServer.loadWorld0(MinecraftServer.java:586) ~[paper-1.20.jar:git-Paper-17]
	at net.minecraft.server.MinecraftServer.loadLevel(MinecraftServer.java:435) ~[paper-1.20.jar:git-Paper-17]
	at net.minecraft.server.dedicated.DedicatedServer.initServer(DedicatedServer.java:308) ~[paper-1.20.jar:git-Paper-17]
	at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1101) ~[paper-1.20.jar:git-Paper-17]
	at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:318) ~[paper-1.20.jar:git-Paper-17]
	at java.lang.Thread.run(Thread.java:1583) ~[?:?]
INFO20:05:41
Preparing start region for dimension minecraft:overworld
Time elapsed: 150 ms
Preparing start region for dimension minecraft:the_nether
Time elapsed: 31 ms
Preparing start region for dimension minecraft:the_end
Time elapsed: 21 ms
20:05:42
Running delayed init tasks
Done (1.205s)! For help, type "help"
Timings Reset
WARN20:05:42
java.lang.RuntimeException: Server attempted to load chunk saved with newer version of minecraft! 4556 > 3463
	at net.minecraft.world.level.chunk.storage.ChunkRegionLoader.loadChunk(ChunkRegionLoader.java:149)
	at io.papermc.paper.chunk.system.scheduling.ChunkLoadTask$ChunkDataLoadTask.runOffMain(ChunkLoadTask.java:338)
	at io.papermc.paper.chunk.system.scheduling.GenericDataLoadTask$ProcessOffMainTask.run(GenericDataLoadTask.java:307)
	at ca.spottedleaf.concurrentutil.executor.standard.PrioritisedThreadedTaskQueue$PrioritisedTask.executeInternal(PrioritisedThreadedTaskQueue.java:351)
	at ca.spottedleaf.concurrentutil.executor.standard.PrioritisedThreadedTaskQueue.executeTask(PrioritisedThreadedTaskQueue.java:118)
	at ca.spottedleaf.concurrentutil.executor.standard.PrioritisedThreadPool$PrioritisedThread.pollTasks(PrioritisedThreadPool.java:274)
	at ca.spottedleaf.concurrentutil.executor.standard.PrioritisedQueueExecutorThread.run(PrioritisedQueueExecutorThread.java:50)
java.lang.RuntimeException: Server attempted to load chunk saved with newer version of minecraft! 4556 > 3463
	at net.minecraft.world.level.chunk.storage.ChunkRegionLoader.loadChunk(ChunkRegionLoader.java:149)
	at io.papermc.paper.chunk.system.scheduling.ChunkLoadTask$ChunkDataLoadTask.runOffMain(ChunkLoadTask.java:338)
	at io.papermc.paper.chunk.system.scheduling.GenericDataLoadTask$ProcessOffMainTask.run(GenericDataLoadTask.java:307)
	at ca.spottedleaf.concurrentutil.executor.standard.PrioritisedThreadedTaskQueue$PrioritisedTask.executeInternal(PrioritisedThreadedTaskQueue.java:351)
	at ca.spottedleaf.concurrentutil.executor.standard.PrioritisedThreadedTaskQueue.executeTask(PrioritisedThreadedTaskQueue.java:118)
	at ca.spottedleaf.concurrentutil.executor.standard.PrioritisedThreadPool$PrioritisedThread.pollTasks(PrioritisedThreadPool.java:274)
	at ca.spottedleaf.concurrentutil.executor.standard.PrioritisedQueueExecutorThread.run(PrioritisedQueueExecutorThread.java:50)
INFO20:05:42
Stopping server
Saving players
Saving worlds
Saving chunks for level 'ServerLevel[world]'/minecraft:overworld
[ChunkHolderManager]: Waiting 60s for chunk system to halt for world 'world'
WARN20:06:42
[ChunkHolderManager]: Failed to halt world generation/loading tasks for world 'world'
INFO20:06:42
[ChunkHolderManager]: Saving all chunkholders for world 'world'
[ChunkHolderManager]: Saved 0 block chunks, 0 entity chunks, 0 poi chunks in world 'world' in 0.00s
ThreadedAnvilChunkStorage (world): All chunks are saved
Saving chunks for level 'ServerLevel[world_nether]'/minecraft:the_nether
[ChunkHolderManager]: Waiting 60s for chunk system to halt for world 'world_nether'
[ChunkHolderManager]: Halted chunk system for world 'world_nether'
[ChunkHolderManager]: Saving all chunkholders for world 'world_nether'
[ChunkHolderManager]: Saved 0 block chunks, 0 entity chunks, 0 poi chunks in world 'world_nether' in 0.00s
ThreadedAnvilChunkStorage (DIM-1): All chunks are saved
Saving chunks for level 'ServerLevel[world_the_end]'/minecraft:the_end
[ChunkHolderManager]: Waiting 60s for chunk system to halt for world 'world_the_end'
[ChunkHolderManager]: Halted chunk system for world 'world_the_end'
[ChunkHolderManager]: Saving all chunkholders for world 'world_the_end'
[ChunkHolderManager]: Saved 0 block chunks, 0 entity chunks, 0 poi chunks in world 'world_the_end' in 0.00s
ThreadedAnvilChunkStorage (DIM1): All chunks are saved
ThreadedAnvilChunkStorage: All dimensions are saved
Flushing Chunk IO
Closing Thread Pool
Closing Server

Seps to reproduce:

New Server Std. install
AMP install
Minecraft instance install

Actions taken to resolve so far:

None, because I don't know what to do.

ThePotatoKing · 7 November 2025 19:33

Those errors mean you’re trying to use an older version of Paper with a world that was loaded in a newer version of Minecraft.

If it’s a new world you’ll want to stop the server, delete the world folder, then start the server to generate a new one.

If this is an already established world, you’ll need to select a Paper version that matches the MC version the world was created on.

Rene_Bachtroegl · 7 November 2025 20:08

Wow!

Thanks for the fast an top support!

system · 7 December 2025 20:08

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