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java.lang.NullPointerException: storage == null	at java.util.Arrays$ArrayList.(Arrays.java:38)	at java.util.Arrays.asList(Arrays.java:155)	at com.nbsp.materialfilepicker.utils.FileUtils.getFileListByDirPath(FileUtils.java:16)	at com.nbsp.materialfilepicker.ui.DirectoryFragment.initFilesList(DirectoryFragment.java:84)	at com.nbsp.materialfilepicker.ui.DirectoryFragment.onViewCreated(DirectoryFragment.java:79)	at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:998)	at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1163)	at android.app.BackStackRecord.run(BackStackRecord.java:793)	at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1552)	at android.app.FragmentController.execPendingActions(FragmentController.java:325)	at android.app.Activity.performStart(Activity.java:6914)	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3216)	at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3349)	at android.app.ActivityThread.access$1100(ActivityThread.java:221)	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1794)	at android.os.Handler.dispatchMessage(Handler.java:102)	at android.os.Looper.loop(Looper.java:158)	at android.app.ActivityThread.main(ActivityThread.java:7225)	at java.lang.reflect.Method.invoke(Method.java)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)