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java.lang.NullPointerException: storage == null at java.util.Arrays$ArrayList.<init>( at java.util.Arrays.asList( at com.nbsp.materialfilepicker.utils.FileUtils.getFileListByDirPath( at com.nbsp.materialfilepicker.ui.DirectoryFragment.initFilesList( at com.nbsp.materialfilepicker.ui.DirectoryFragment.onViewCreated( at at at at at$ at android.os.Handler.handleCallback( at android.os.Handler.dispatchMessage( at android.os.Looper.loop( at at java.lang.reflect.Method.invoke(Native Method) at java.lang.reflect.Method.invoke( at$ at