My server has been running completely fine. However, I started it today and out of nowhere I received these two messages in the console:

[Worker-Main-18/WARN] [ModernFix/]: Suspicious async chunkload, pass -Dmodernfix.debugBadChunkloading=true for more details

[06:00:12] [Worker-Main-18/ERROR] [ModernFix/]: Async chunk load took way too long, this needs to be reported to the appropriate mod.

and the server stopped loading, I have attached the log.
latest_log.txt