Cant join my running server. (skyfactory 3)

[Crashingtnt]

I finally got my server running yet I cant join. I get 1 of 2 error messages.
1) Fatally missing Blocks and Items
2)Internal Exception: java.lang.RuntimeException: invalid id 1 - Maximum id range exceeded.

I've redownloaded all the mods several times and nothing seems to fix it, yet singleplayer works like a charm.

Help would be really appreciated

 

[Striven]

is this an imported world? have you installed Just Enough IDs<?