my first beemod map HELP

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''HEPs in CO OP'' is my first map made with BEEMOD. it's a co op chamber with High Energy Palets. it's a bit laggy when i play-test it my self, but when i try to play-test it with a friend, i send him an invite, he joins and then the game is going back to the main menu. it's not starting because of the mod, or the new test elements (HEPs), or both, i don't know. IDEAS???