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Post the crash report:
This crash report has been saved to: /home/gameservers/services/service12477/files/./crash-reports/crash-2017-05-22_16.00.01-server.txt
You can find worldedit here, https://minecraft.curseforge.com/projects/worldedit It is a forge mod so it goes into the mods folder. You should be able to find permission plugins at the Sponge forum
Update you GPU drivers, also for a 1.7.10 pack 8 gigs or ram is too much, 4 should be enough.
https://forum.feed-the-beast.com/threads/issues-with-nvidia-drivers-378-49-preventing-minecraft-loading.214966/
Here is the modtweaker page for thermal expansion, http://minetweaker3.powerofbytes.com/wiki/ModTweaker:Thermal_Expansion_Support
I also included an example recipe to craft a thaumcraft shard in the other thread you started.
The first error is caused by corrupted simple achievements data, deleting the simple achievements foler should fix that.
The second error should be pretty clear: java.lang.RuntimeException: java.io.IOException: The process cannot access the file because it is being used by another process