Eto Form set property exception

Im getting an error with an eto form that I have writen in a python script. This has been working for some time, but now suddenly not working. Im trying to fix this but dont really know where to start.

As a test, I have a also copied in the ‘request a room’ example that is on the guides and I am also getting this same error which makes me think it is nothing to do with the script itself.

The error is:

Message: Set property ‘System.Windows.ResourceDictionary.Source’ threw an exception.


  • line 64, in RequestRoomNumber, “C:\Users\Josh.D\AppData\Local\Temp\”*
  • line 73, in , “C:\Users\Josh.D\AppData\Local\Temp\”*

Thanks in advance.

Hi @JoshD,

Without the script, and direction on how to use so we can repeat what you are see, we really cannot help you.

Also, what version and service release of Rhino are you using? Do you recall what version and service release of Rhino your script once ran successfully in?


– Dale