Forge Server not starting "missing mods unkown : need"

[Joosl]

Hey! Me and a friend are creating a Server with a big modpack. We cannot start the server, because of the error "missing mods unkown : need"
Here's a part of the log:

Missing Mods:
    unknown : need [14.23.5.2826,): have 14.23.5.2768

Missing Mods:
    unknown : need [14.23.5.2779,): have 14.23.5.2768

Missing Mods:
    unknown : need [14.23.5.2781,99999.24.0.0): have 14.23.5.2768

Missing Mods:
    unknown : need [14.23.5.2816,): have 14.23.5.2768

Missing Mods:
    unknown : need [14.23.5.2831,): have 14.23.5.2768

Missing Mods:
    unknown : need [14.23.5.2813,): have 14.23.5.2768

Missing Mods:
    unknown : need [14.23.5.2772,): have 14.23.5.2768

Missing Mods:
    unknown : need [14.23.5.2779,): have 14.23.5.2768

I would love to see answers! Thank you right away!
 

-Joosl