crash-2016-11-23_20.25.55-server.txt

Your modpack just released an update that includes the newer RFTools version than the one you currently have in the crash report - go update and see if that fixes your issue.

I was having this problem and updating rftools to 5.62 fixed it.

Thank you for taking the time to create this issue, as we're no longer supporting versions below 1.12, I'm going to go ahead and close it but if this bug seems to continue over to newer versions, please do report it again so we can investigate the issue further.