A fatal error has occured, this connection is terminated

[Sylvans]

I am playing on a custom modpack created through FTB Direwolf 20 1.7.10. Single player works fine, although when i created a server through online hosting i keep getting booted on login with error mentioned in the title. Here is the pastebin on what my console says: http://pastebin.com/rRmAmhAK.

 

I tried several things as changing enderio configs, deleting enderio with it's core mod as well as deleting morph mod. I still get the error popup. Server starts correctly everything runs smooth until I try to log in.

I'm looking for prompt reply.

 

@Edit: I tried different versions of forge from 10.13.4.1558 to 1566

Edited March 14, 2017 by Sylvans