Server suddenly crashed when tried to join.

Hi there!

Today I tried to play Minecraft on my server, but this time when I tried to join it suddenly stopped.

Here is the crash log: https://mclo.gs/7JstSyE

I suspect it is The Hordes mod, but I would also like to know what others think.

Thank you in advance for your reply!

Update: I created a new server and readded the mods. For some reason, it is working now. Thanks for the reply though.