I apologize if this isn't the mod's fault. I am still new to reading my crash reports and have never done any bug reporting before. Anyways I'm playing Foolcraft 3 v1.3.1. The title says the issue i found in the crash report. It happened to me twice (I reverted a backup the first time). Heres the logs:

crash-2018-06-16_21.27.42-server.txt
crash-2018-06-15_15.12.31-server.txt

Please help me to understand if it is something I'm doing on my end to cause these crashes.

It is the fault of ftblib

It means you should report the bug to FTBLib.

can you elaborate on that? I don't really know if that means i should update something or what.....