Chiselandbits mod is not workling

Please Help.

I have chiselandbits installed on my server and it works without crashes. But when I go into creative mode and go to ChiselandBits, no items or blocks are displayed. What can I do?

I do not know if thats important, but it works in singleplayer

Btw its the same with the newest version of Mo´Creatures. It even crashes when I click on the Icon

And I figured out that it is the same problem with Kaishi´s Weapons