Problem Server wont start anymore(Mystcraft Problem/Chickenchunks Problem)

[Zambogerami]

Since my last play the server wont start anymore, it gives me the error message in the text file. I haven't done anything that would crash the server in my opinion. But i don't even know. Help is very appreciated
Btw the server gets xms2G and xmx 3G Ram. That should be enough.

 

[Zambogerami]

If i delete the player.dat in the world/chickenchunks folder the server starts but i cant travel to my old mystcraft ages,where i built quite much. so this is no opportunity. i just want my two important worlds out of these ages. I cant open these two worlds with nbtedit as well.If someone understands this error message pls help me. I dont want to lose those ages

 

[Zambogerami]

ANYBODY there? Pls help. i cant even update to the new version. same error message