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java.lang.ClassCastException: [I	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:295)	at sun.awt.image.ImageRepresentation.setPixels(ImageRepresentation.java:532)	at java.awt.image.RGBImageFilter.filterRGBPixels(RGBImageFilter.java:183)	at java.awt.image.RGBImageFilter.setPixels(RGBImageFilter.java:217)	at ButtonFilter.setPixels(ButtonFilter.java:198)	at java.awt.image.CropImageFilter.setPixels(CropImageFilter.java:119)	at sun.awt.image.OffScreenImageSource.sendPixels(OffScreenImageSource.java:73)	at sun.awt.image.OffScreenImageSource.produce(OffScreenImageSource.java:162)	at sun.awt.image.OffScreenImageSource.addConsumer(OffScreenImageSource.java:37)	at sun.awt.image.OffScreenImageSource.startProduction(OffScreenImageSource.java:51)	at sun.awt.image.ImageRepresentation.replay(ImageRepresentation.java:897)	at sun.awt.image.InputStreamImageSource.updateFromStore(InputStreamImageSource.java:293)	at sun.awt.image.InputStreamImageSource.doFetch(InputStreamImageSource.java:237)	at sun.awt.image.ImageFetcher.fetchloop(ImageFetcher.java:172)	at sun.awt.image.ImageFetcher.run(ImageFetcher.java:136)