tkinter.TclError: image “pyimage3” doesn’t exist

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I found the issue so figured I’d answer myself for anyone who has this issue in the future.

When the wlcm_scrn runs procedurely it is the only window that exists at that point in time, and so it can use tkinter.Tk(). The error arises because the button that calls the function is itself sitting in an active window that is also running as Tkinter.Tk(). So when Python/Tkinter tries to build wlcm_scrn from the button, it’s essentially trying to create two windows under root and falling over.

The solution:

Changing line…

wlcm_scrn = tkinter.Tk()

to this…

wlcm_scrn = tkinter.Toplevel()

…stops the error, and the image shows.

I personally am going to have two instances of the function. One called procedurely under Tk(), and one called within the application under TopLevel().

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