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java.lang.NullPointerException at net.sf.jabref.gui.CleanUpAction.doRenamePDFs(CleanUpAction.java:494) at net.sf.jabref.gui.CleanUpAction.run(CleanUpAction.java:276) 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 spin.Invocation.evaluate(Invocation.java:175) at spin.off.SpinOffEvaluator$1.run(SpinOffEvaluator.java:108) at java.lang.Thread.run(Thread.java:744)