Ftb ultamte server issue with mismatched id's

yout2

New Member
Jul 29, 2019
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my friend just downloaded the server so me and him can try it out i have connected to his servers on normal minecraft before but when i try to join his now this error pops up can someone please tell me how to fix it? it would be really great if someone could
 

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Virgoddess

New Member
Jul 29, 2019
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You need to make sure you're both running the same version of the Ultimate Pack as the one he installed on his server.