when trying to specify a seed for generation

[Caedus-Renegade]

appearently when coming to any sort of custom objects it crashes with this line
"[03:05:16] [Server thread/INFO] [FML]: The state engine was in incorrect state SERVER_STOPPING and forced into state SERVER_STOPPED. Errors may have been discarded."
crash-2018-04-24_03.05.13-server.txt