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java.lang.NullPointerException: 	at org.eclipse.jgit.internal.storage.file.UnpackedObjectCache$Table.index(UnpackedObjectCache.java:146)	at org.eclipse.jgit.internal.storage.file.UnpackedObjectCache$Table.contains(UnpackedObjectCache.java:109)	at org.eclipse.jgit.internal.storage.file.UnpackedObjectCache.isUnpacked(UnpackedObjectCache.java:64)	at org.eclipse.jgit.internal.storage.file.ObjectDirectory.openObject(ObjectDirectory.java:367)	at org.eclipse.jgit.internal.storage.file.WindowCursor.open(WindowCursor.java:145)	at org.eclipse.jgit.treewalk.CanonicalTreeParser.reset(CanonicalTreeParser.java:202)	at javadiff.RepoDiff.compare(RepoDiff.java:40)	at javadiff.GitDiff.main(GitDiff.java:30)