If You experience problem during packaging with this info message:

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An exception occured (when parsing line 237):
Parse error
Non-SVG icon can not have an unnamed mask
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Aborted, ERRORS ENCOUNTERED!


It is related to using transparent (GIF, JPG or PNG) graphics on background (in my case it was Music Player background)
Workaround:
Save the file as .bmp ( no transparency), copy/paste to the tool => no mask will be created => packaging problem solved.