I have been using the platform to service a self-constructed mod-pack for me and a few friends, we run roughly 140 mods. While I have decent experience hosting servers, especially ones that feature my own mod-packs, I do sometimes have trouble solving issues when my experience and research comes up dry. My research showed that the same error has occurred for people running AE2 (solved) and normally relates to problems with mobs. I cannot see either of these being the problem. Paste bins below contain the crash log, and the server log. I hope this is the right place to seek help for this issue, some other helpful information: the problem seems to be connected to the world file, single player worlds and new server worlds function fine, and it should not be a RAM issue as I run the server with a dedicated 8 gigabytes of RAM.
Crash Log: https://pastebin.com/yTEnvZTD
Run Log: https://pastebin.com/bgTCpGf9