Internal error code: (11090009333;370+8) BAD ARGUMENT #1 TO 'lOCALIZE' (STRING EXPECTED, GOT NIL)

I had the same problem too. After doing some digging I found out the problem.

Appearently the CH files dont like it when other devices that can connect to your computer are connected, and sharing files between devices.
In my case, it was a pinter my computer was connected to wirlessly, and after going into settings and removing it, that fixed it!
In short, find out if your computer is connected to any devices, and remove them in settings.

I hope with was helpful for you, and for anyone else who finds this.

Bumping this thread. I still haven't found a solution to this and can no longer use the app, which is a shame.