Unknown Error/Server Crashing

Hi their, I was advised to visit these forums to help fix my server, which I have running spigot.

Here is a pastebin of the server logs before the server crashed + the error: http://pastebin.com/GZVsjfLR

I'm in desperate need to get my server up, so if you know what it is and have a solution please respond ASAP!

Thanks,
Mirra