Feed the Beast

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Tech specs:
OS: Linux Ubuntu 64Bit
RAM (for mc server): 6GB out of 16GB
Java version: 1.7.0_25 64Bit

The server starts just fine until the world has finished loading then it crashes with an JSON exception from numina. I can run other FTB servers just fine (Magic Farm). It is a fresh installation with a new world and the only thing i have changed or added are the JVM flags: (changes are bold)
-server -Xms6G -Xmx6G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:parallelGCThreads=2 -XX:ConcGCThreads=1 -XX:permSize=128m

The whole computer is dedicated to MC servers so no other applications are running.
Crash log is added

Please help