Professor Tenebrae

I know many people have had this error and I've looked up all kinds of ways to fix it. I've tried repairing it with MC Edit, I've tried running chunkster to fix it, I've tried rebuilding the world files, I've tried deleting the dimesional doors files and player files in case it was a shovel in someones inventory or something, I'm out of ideas. And I didn't want to bother anyone with it really. No, I didn't make a backup yet because it's a relatively young world, and some might say I might as well give up and restart in that case but I would like to keep my world so if anyone has any more ideas or could help me fix it I would appreciate it. Error Log: (Sorry it's an image, couldn't figure out how to get the code to copy)