An error has occurred. This application may no longer respond until reloaded. Reload

[Al-Rashed]

An error has occurred. This application may no longer respond until reloaded. Reload

[SimoxAB]

same issue

[GamingBeast015]

same issue

[deposted]

I think Steam getting an update made this error pop up.

Fixed this by deleting all the files and folders in AppData\Roaming\TcNo Account Switcher and got everything to work again.