Modded tekkit legend

[iblis]

Hey.

I was not sure were to post it :/

I'm running a small tekkit legend server with more mods and a friend of mine got this error (see crash report) 

 

We are 2 other guys and we can play and all but he can't even enter the server  just crashes when he connects.

 

Tried deleting and installing fresh legend with the mods on but it will not function

 

Any advise?

crash-2017-04-02_15.23.01-client.txt