This is an old error that potentially is preventing people from playing with my restart modes (such as leagues and automatic evolutions)
I finally figured out what is causing it. Basically if you have a file open in the "league" or "evolution" folder and after that without closing the file or folder initiate a new restart mode the program will crash trying to delete the old league or evolution folder recursive.
The problem is, after that crash if you run the program again, it is still trying to look for a restart mode and the whole install of the program seems butched.
The quick work around for now instead of reinstalling darwinbots completely just delete "restartmode.gset" file from the main folder.