The log points to Chisel as the culprit. At first it was throwing this error for aluminum, and since that material doesn't exist in my set of mods, I tried disabling that feature(and others for materials not present in the pack) from the config - only for it to then throw the same thing for basalt. Which should definitely be present from this mod.

https://paste.ee/p/ufnQ1

Getting the same crash. First Aluminium then basalt. Have several mods that have basalt in.

http://pastebin.com/1SzmAgL9 - Alu

http://pastebin.com/F0SX1W03 - Basalt

I'm also throwing this error.
http://pastebin.com/hMzT5eXH

Same issue here :-)
crash-2016-09-22_13.51.11-server.txt

I have exactly the same problem too.

Sorry about this. I'm working on a fix now.

It's fine don't worry, it happens to everybody to make errors. ;)