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java.lang.NullPointerException: 	at sun.plugin.cache.CacheFile.getFileType(CacheFile.java:81)	at sun.plugin.cache.CacheFile.before(CacheFile.java:127)	at sun.plugin.cache.CleanupThread$1.compare(CleanupThread.java:204)	at java.util.Arrays.mergeSort(Arrays.java:1237)	at java.util.Arrays.mergeSort(Arrays.java:1244)	at java.util.Arrays.mergeSort(Arrays.java:1245)	at java.util.Arrays.mergeSort(Arrays.java:1244)	at java.util.Arrays.mergeSort(Arrays.java:1245)	at java.util.Arrays.mergeSort(Arrays.java:1244)	at java.util.Arrays.mergeSort(Arrays.java:1244)	at java.util.Arrays.sort(Arrays.java:1185)	at sun.plugin.cache.CleanupThread.getFilesInCache(CleanupThread.java:200)	at sun.plugin.cache.CleanupThread.cleanCache(CleanupThread.java:122)	at sun.plugin.cache.CleanupThread.run(CleanupThread.java:93)