This is a Base Version of a basic Forge Mod (1.12.2) It was programmed using the latest IntelliJ IDEA version (you can just import it to IntelliJ by selecting the "build.gradlew" To be sure that ...

net.minecraftforge.fml.common.LoaderException: java.lang.ClassNotFoundException: mezz.jei.startup.ProxyCommonClient at net.minecraftforge.fml.common.ProxyInjector ...