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java.lang.NullPointerException: storage == null at java.util.Arrays$ArrayList.<init>(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:919) at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1083) at android.app.BackStackRecord.run(BackStackRecord.java:834) at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1470) at android.app.FragmentManagerImpl$1.run(FragmentManager.java:452) at android.os.Handler.handleCallback(Handler.java:739) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:145) at android.app.ActivityThread.main(ActivityThread.java:6934) at java.lang.reflect.Method.invoke(Native Method) at java.lang.reflect.Method.invoke(Method.java:372) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1404) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1199)