https://hastebin.com/uxedodosoy.vbs

When I create a new world with Psi in my modpack I get the following message:
https://goo.gl/rjtHV7

Clicking Yes freezes the game and never loads the world, clicking no takes me back to the main menu (may be an issue with Custom Main Menu)

Have the same message in minecraft with this version. Forge 1.11.2 - 13.20.0.2228
The log gives me this:
http://pastebin.com/Sp5fAw0T
You can see Farseek API in the error log but removing it doesn't remove the error.

I don't have Custom Main Menu but I have about a 100 mods.
This doesn't happen if I only use the Psi mod but I'm currently too lazy to figure out what conflicts as removing Psi fixes the level.dat corruption problem.

If I feel like it I might single it out on a later date.