java.lang.ClassCastException: java.lang.Object

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java.lang.ClassCastException: java.lang.Object
at java.awt.image.ColorModel.getAlpha(
at java.awt.image.ColorModel.getRGB(
at sun.awt.image.ImageRepresentation.convertToRGB(
at sun.awt.image.ImageRepresentation.setPixels(
at java.awt.image.AreaAveragingScaleFilter.accumPixels(
at java.awt.image.AreaAveragingScaleFilter.setPixels(
at sun.awt.image.PixelStore8.replayLines(
at sun.awt.image.PixelStore.replay(
at sun.awt.image.PixelStore.replay(
at sun.awt.image.InputStreamImageSource.updateFromStore(
at sun.awt.image.InputStreamImageSource.doFetch(
at sun.awt.image.ImageFetcher.fetchloop(

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