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java.lang.NullPointerException: 	at java.util.ArrayList.addAll(Unknown Source)	at com.sun.pdfview.annotation.WidgetAnnotation.getPageCommandsForAnnotation(WidgetAnnotation.java:221)	at com.sun.pdfview.PDFPage.setAnnots(PDFPage.java:666)	at com.sun.pdfview.PDFFile.createPage(PDFFile.java:1661)	at com.sun.pdfview.PDFFile.getPage(PDFFile.java:1533)	at com.benryan.conversion.PdfSlideConversionBatchTask.convertFile(PdfSlideConversionBatchTask.java:105)	at com.benryan.conversion.PdfSlideConversionBatchTask.convertFile(PdfSlideConversionBatchTask.java:33)	at com.benryan.conversion.AbstractSlideConversionTask.call(AbstractSlideConversionTask.java:50)	at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)	at java.util.concurrent.FutureTask.run(Unknown Source)	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)	at java.lang.Thread.run(Unknown Source)