- Go into the settings, select the version of Forge that you want, and press
Donwload/Update
- See if it starts
- Try running the server without pixelmon and make sure forge starts correctly.
i. If so, delete the world
folder before adding pixelmon again
- Make sure you’re using the right Java version for the version of Forge you’re running
Also, take a read through this FAQ here if you run into further issues: