When selecting a widget for a transparent background, i.e. Crop Image, the widget shows the background, but in the property window the IDE does not select the pic background and has to be set manually. This causes a compiler error.
Crop image uses a "section of" another image
It is not sufficient just to change the Component .sta to crop image
it also requires that the .picc image is stated for which image is to be used for cropping.
When these two (.sta and .picc) attributes are set, there is no compile error.
If one of the required conditions (.picc) is not yet met
it does raise a compile error informing the user of what needs to be fixed
Such compile errors to inform the user is not a bug.
Compile errors are intentional so user can fix their problems.