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java.lang.NullPointerException: 	at org.apache.pdfbox.pdmodel.font.PDFontFactory.createFont(PDFontFactory.java:100)	at org.apache.pdfbox.pdmodel.font.PDFontFactory.createFont(PDFontFactory.java:75)	at org.apache.pdfbox.pdmodel.PDResources.getFonts(PDResources.java:115)	at org.apache.pdfbox.util.PDFStreamEngine.processSubStream(PDFStreamEngine.java:243)	at org.apache.pdfbox.util.PDFStreamEngine.processStream(PDFStreamEngine.java:225)	at org.apache.pdfbox.util.PDFTextStripper.processPage(PDFTextStripper.java:442)	at org.apache.pdfbox.util.PDFTextStripper.processPages(PDFTextStripper.java:366)	at org.apache.pdfbox.util.PDFTextStripper.writeText(PDFTextStripper.java:322)	at org.dspace.app.mediafilter.PDFFilter.getDestinationStream(PDFFilter.java:101)	at org.dspace.app.mediafilter.MediaFilterManager.processBitstream(MediaFilterManager.java:737)	at org.dspace.app.mediafilter.MediaFilterManager.filterBitstream(MediaFilterManager.java:561)	at org.dspace.app.mediafilter.MediaFilterManager.filterItem(MediaFilterManager.java:511)	at org.dspace.app.mediafilter.MediaFilterManager.applyFiltersItem(MediaFilterManager.java:479)	at org.dspace.app.mediafilter.MediaFilterManager.applyFiltersAllItems(MediaFilterManager.java:414)	at org.dspace.app.mediafilter.MediaFilterManager.main(MediaFilterManager.java:333)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:606)	at org.dspace.app.launcher.ScriptLauncher.runOneCommand(ScriptLauncher.java:225)	at org.dspace.app.launcher.ScriptLauncher.main(ScriptLauncher.java:77)