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java.lang.NullPointerException: 	at java.util.ComparableTimSort.sort(ComparableTimSort.java:142)	at java.util.Arrays.sort(Arrays.java:1957)	at eu.geopaparazzi.library.core.activities.DirectoryBrowserActivity.getFiles(DirectoryBrowserActivity.java:215)	at eu.geopaparazzi.library.core.activities.DirectoryBrowserActivity.onCreate(DirectoryBrowserActivity.java:168)	at android.app.Activity.performCreate(Activity.java:5277)	at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1088)	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2317)	at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2415)	at android.app.ActivityThread.access$800(ActivityThread.java:166)	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1336)	at android.os.Handler.dispatchMessage(Handler.java:110)	at android.os.Looper.loop(Looper.java:193)	at android.app.ActivityThread.main(ActivityThread.java:5353)	at java.lang.reflect.Method.invokeNative(Native Method)	at java.lang.reflect.Method.invoke(Method.java:515)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:830)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:646)	at dalvik.system.NativeStart.main(Native Method)