Hello,
This is a non-fatal error, which means an error that does not crash the program at runtime.
This error occurs when a font that does not exist in the Fonts folder is referenced.
For example: If you set the font for a page FontFamily="Arial"
and it does not exist, the application will display this error message when it starts and will switch to the default font.
Workaround: Check your xaml page and remove the wrong reference to the font.
Best Regards,
Alec Liu.
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