We have already tried compiling ourselves but are having issues with kotlin

Build file 'R:\1Developer\Mods\BetterP2P-1.20\build.gradle' line: 2

Plugin [id: 'org.jetbrains.kotlin.jvm', version: '1.8.22'] was not found in any of the following sources:

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Try lowering Kotlin version to the KFF shipped version in 1.19.2, and change gradle.properties in root project maybe