In this post, you’ll learn about the Windows System Error ERROR_WINDOW_NOT_DIALOG (0x58C)] and the reason why you are receiving the error message
How does this Error in Windows Look like?
Error Code 1420 ERROR_WINDOW_NOT_DIALOG (0x58C)]
Why do you receive the System Error Error Code 1420 ERROR_WINDOW_NOT_DIALOG (0x58C)] in Windows?
The window is not a valid dialog window.