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The name of the mod

Custom Pack

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Minecraft Version

1.20.1

The Issue

My friends and myself when on the server are unable to use battle mod. But when we go to single player worlds it works just fine. I have removed mod that said incompatible and it doesn't fix itself. I do a fresh install of Forge 47.3.6 every time. Any help would be apparated.
009.zip

Steps to Reproduce

I don't know why it happens.