Server Crash using ATG

[Redweevil]

I'm renting a server from CreeperHost and am attempting to run the Horizon pack. However when I try to use ATG for the generation of the world the server crashes midway through generating the world.

Heres the crash log http://pastebin.com/ZxB8zcyM

Thanks in advanced

 

[NEXUS2345]

You are out of heap memory space, use the More Information part of this link http://desk.feed-the-beast.com/index.php?/Knowledgebase/Article/View/9/0/basic-troubleshooting