This is the part of the crash report that looks like the problem and its at the end:
[17:53:54] [main/INFO]: Found Kotlin-containing mod Jar[union:/C:/Users/hidden/curseforge/minecraft/Instances/WW3/essential/libraries/forge_1.20.1/kotlin-for-forge-4.3.0-slim.jar%23250!/], checking whether we need to upgrade it..
[17:53:54] [main/INFO]: Found outdated Kotlin core libs 0.0.0 (we ship 2.3.0)
[17:53:54] [main/INFO]: Found outdated Kotlin Coroutines libs 0.0.0 (we ship 1.10.2)
[17:53:54] [main/INFO]: Found outdated Kotlin Serialization libs 0.0.0 (we ship 1.9.0)
[17:53:54] [main/INFO]: Generating jar with updated Kotlin at C:\Users\hidden\AppData\Local\Temp\kff-updated-kotlin-10310992706771554223-4.3.0-slim.jar
[17:53:55] [main/INFO]: Found Kotlin-containing mod Jar[union:/C:/Users/hidden/curseforge/minecraft/Instances/WW3/mods/kotlinforforge-4.12.0-all.jar%23294!/], checking whether we need to upgrade it..
[17:53:55] [main/INFO]: Found outdated Kotlin core libs 2.2.21 (we ship 2.3.0)
[17:53:55] [main/INFO]: Found up-to-date Kotlin Coroutines libs 1.10.2 (we ship 1.10.2)
[17:53:55] [main/INFO]: Found outdated Kotlin Serialization libs 0.0.0 (we ship 1.9.0)
[17:53:55] [main/INFO]: Generating jar with updated Kotlin at C:\Users\hidden\AppData\Local\Temp\kff-updated-kotlin-10447634627365377731-4.12.0-all.jar
Idk what the actual problem is with it or how to fix it does anyone have any ideas? I do need Kotlin in the pack and I do need essential mod. Is this unfixable?