Creeperhost ftb server crashing all the time

Hi,

So my friend recently bought a ftb server on creeperhost. and the first half hour playing goes all fine (with just 2 players), but then whenever we travel out (sometimes even when we aren't even doing anything) the server just crashes every 2 minutes (5 minutes tops) so if anyone knows any more about this, or someone who had this same problem please share all the information you can give us. anyway here's the pastebin link to the crash log: http://pastebin.com/Zy72N6yS

So...

Creeperhost ftb server crashing all the time