Skyfactory 3 cant join the server

Me and my friend started a Skyfactory 3 server and it worked fine until the new skyfactory update now we cant join the server because it says

1. (Fatally Missing Blocks and Items)
2. Internal Exception: java.lang.IllegalArgumentExeption: The name extrautils2:synergy has been registered twice, for Block{null} and Block{extrautils2:synergy},

Whenever i try to join it says this. Theres anything i can do about it, or we have to stop playing?