MystCraft World Gen crashes server

[EquinoxPT]

Hi! Today i'm having a few crashed exploring MystCraft Worlds.

I'm running the server with stock Settings on my i5 4690k 4.6GHz and 8GB 2400MHz Ram on a SSD.
Is it lack of Processing Power?

Crash Report
http://pastebin.com/2sBAa5wa

Log
http://pastebin.com/8aKfi5ux