Server crashes

After installation MoCreatures mod the server began to crash often. In a today already 6 times. I don’t want to delete this mod, it is necessary to learn a problem and to fix it.
On the server there is many loaded chunkes (till 6000) and entityes (till 30000). Possibly it also is the reason of crashes.
All information about mods and their versions, present in crash reports.
Reports in archive: