Hi,
the Mod with the cool Idears crash by start and it give only this one Massage on the Screen. But it give no Crash Report what the Fail is. I hope you can check this what not work in this mod by the Start.

Minecraft 1.12.2
Forge Version: newest Version with ending 2860

Only Pick the mod in the Mods Folder and Start Minecraft and the Minecraft will then the loading Stream is finish not Start the Launcher and Crash in the first second with this Screen mistake Exit-Code: 1

Forgot to mention it on the mod page, you need MixinBooter to run the mod.

ah okay Mixin

yes work now. Thank you