Can't join server while having mod inside a modpack (0.2.1)

[MimStar]

Hey, I'm making a modpack to play with friends and when adding the mod and trying to test i can't join the server.
Sadly no crash or logs, it seems to just take a really long time. Is this supposed to happen?

Otherwise, seems to be a great mod. I'll follow the progress!

[Cy4Shot]

Could you send me a list of mods? Or the whole pack if you can?

I'll test it to see if I can reproduce