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The function RemoveMG does not exist in maps/mp/gametypes/_weapons.gsc. And that is why the mod doesn't work.

You can do now two things:
Comment the line 'thread...

Read the file "console_mp.log". Look for the words "script runtime" or "script compile". It will tell you the error. No one can help you unless we know what the error is.

So what's the error-message?