It's likely due to a missing resource or an issue with the image file itself. Make sure the path to "images/black_king.png" is correct relative to your executable's working directory, and check if the image format is supported by Qt. You can add error handling by checking if blackKingPixmap.load() returns false, which will help identify if the loading failed. Additionally, consider using QImage for debugging, as it may provide more informative error messages.
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