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No problem, glad I could help!

The following is a tutorial for Intellij by an accomplished mod developer. The tutorial is 2 years old, but the workflow should still be relevant

"Please do your research before posting here." is rude. The OP's question in itself is an act of research. "Please do your research before posting here" is not a fact. It's an imperative. The OP comes here asking for help and he is being told to "do your research." Get over yourselves. If you don't want to be helpful then what are you doing here besides berating people? Or is this forum only for the "elite"?

Don't tell ppl "do your research before posting here" as the README.txt file that comes with the MDK of Forge 1.13.2 25.0.9 and 25.0.10 says to use setupDecomWorkspace its obvious that the README.txt file was not updated but you don't have to be a dick.

NINJA EDIT I figured it all out. The solution is to create a custom slot (non vanilla slot) and specify it in the class to only allow said items example the slot inside container class

I don't know if this is a Forge issue or something that needs to be updated mod side. If you have a mod that uses the Forge javascript asm, and one that uses Mixin to change methods in the same class, prior to 33.0.40 the two could coexist but afterwards Mixin crashes. Up to 33.0.34; works 33.0.35; Crashed: ClassCastException (this looks to be unrelated) 33.0.36 and 33.0.37; works 33.0.40; Crashed: MixinInitialisationError 33.0.41 and up; Crashed: ReEntrantTransformerError: Re-entrance error org.spongepowered.asm.mixin.transformer.throwables.ReEntrantTransformerError: Re-entrance error. at org.spongepowered.asm.mixin.transformer.MixinProcessor.applyMixins(MixinProcessor.java:278) at org.spongepowered.asm.mixin.transformer.MixinTransformer.transformClass(MixinTransformer.java:206) at org.spongepowered.asm.mixin.transformer.MixinTransformationHandler.processClass(MixinTransformationHandler.java:109) at org.spongepowered.asm.launch.MixinLaunchPlugin.processClass(MixinLaunchPlugin.java:135) at cpw.mods.modlauncher.serviceapi.ILaunchPluginService.processClassWithFlags(ILaunchPluginService.java:154) at cpw.mods.modlauncher.LaunchPluginHandler.offerClassNodeToPlugins(LaunchPluginHandler.java:85) at cpw.mods.modlauncher.ClassTransformer.transform(ClassTransformer.java:119) Mod using JavaScript: https://www.curseforge.com/minecraft/mc-mods/shetiphiancore/files/3054955 Mod using Mixin: https://www.curseforge.com/minecraft/mc-mods/botania/files/3049237 - Dependencies: -- https://www.curseforge.com/minecraft/mc-mods/patchouli/files/3037298 -- https://www.curseforge.com/minecraft/mc-mods/curios/files/3042479