Hey guys, 
  
My first post here is immediatly a very frustrating problem. When loading my main world on either single player or my server, it gives a strange error about a certain dimension. I have NO idea how to fix it. Here are as many logs as I can provide: 
  
1. The ForgeModLoader-client-0.log: 
  
  
  
2. The Minecraft crashreport: 
  
  
  
3. When running on my server, the ForgeModLoader-server-0.log: 
  
  
  
Please note, the above error also occurs WITHOUT any mods installed. 
  
What I already tried: 
- Removing any obsolete files. 
- Removing the DIM1 and DIM-1 folders. 
- Running without any mods. 
- Starting without Forge (which works perfectly fine)