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java.lang.ClassCastException: 	at java.awt.image.ColorModel.getAlpha(ColorModel.java:814)	at java.awt.image.ColorModel.getRGB(ColorModel.java:859)	at sun.awt.image.ImageRepresentation.convertToRGB(ImageRepresentation.java:271)	at sun.awt.image.ImageRepresentation.setPixels(ImageRepresentation.java:485)	at java.awt.image.AreaAveragingScaleFilter.accumPixels(AreaAveragingScaleFilter.java:196)	at java.awt.image.AreaAveragingScaleFilter.setPixels(AreaAveragingScaleFilter.java:235)	at sun.awt.image.PixelStore8.replayLines(PixelStore8.java:38)	at sun.awt.image.PixelStore.replay(PixelStore.java:217)	at sun.awt.image.PixelStore.replay(PixelStore.java:146)	at sun.awt.image.InputStreamImageSource.updateFromStore(InputStreamImageSource.java:295)	at sun.awt.image.InputStreamImageSource.doFetch(InputStreamImageSource.java:244)	at sun.awt.image.ImageFetcher.fetchloop(ImageFetcher.java:168)	at sun.awt.image.ImageFetcher.run(ImageFetcher.java:136)