The game starts launching normally but sometime during the launch process just closes with the mixin error provided.

Please note I tried running majruszs-difficulty-forge-1.20.1-1.9.2.jar on NeoForge 1.20.1 as the code base is compatible... and the game ran fine. I was even able to boot up and play a Singleplayer world with no issues.

Personally, I think this could be some compatibility issue with another mod.

• Version: majruszs-difficulty-neoforge-1.20.1-1.9.2.jar
• Game Version: 1.20.1 on NeoForge.

another_error_for_you.txt

Hello, thanks for the report, the latest 1.9.3 version should work fine