Randomly, server stopped working (Can't start)

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So erm, out of nowhere today, the server went 'down'. It said it was up, but players were kicked off and users could no longer join.

 

When I went to restart it, it wouldn't restart, and tons of ID conflicts started popping up from plenty of different mods. I've tried to fix these manually even though I haven't messed around with configs at all, but to no avail. I'm wondering if the conflict issues are not the reason why the server does not start.

 

Here's a quick log of the error when I try to start the server:

 

http://pastebin.com/cB7Qmgkt