The crash message does not really provide information about the mod which causes the problem.
I can only recommend to try to remove mod by mod and check when the problem is gone.
Looks like it was caused by Apotheosis, the issue has already been reported. Anyway, thanks for the help, I assume this thread will be closed now!
PS. In this case at least, downloading the world, trying to run it on Singleplayer and then checking the logs that outputs was a more efficient way to figure out the problematic mod as it provided more insight, rather than removing them one by one and restarting the server.