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java.lang.IllegalStateException: No input source set!	at com.sun.imageio.plugins.png.PNGImageReader.getNumImages(PNGImageReader.java:1347)	at net.sourceforge.tess4j.util.ImageIOHelper.getIIOImageList(ImageIOHelper.java:337)	at net.sourceforge.tess4j.Tesseract.doOCR(Tesseract.java:212)	at net.sourceforge.tess4j.Tesseract.doOCR(Tesseract.java:196)	at undefined.Testing.main(Testing.java:23)