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  1. ,
    Expert tip

    Android SDK 23 introduced a new way to handle permissions, so as a temporary workaround you can set it to build for SDK below 23. As a permanent solution you have to ask user during runtime for permissions with checkSelfPermission() or requestPermissions()

  2. ,
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    MANAGE_USERS has a protection level of signature|system, so your application must be signed with the platform key. Take a look on this https://goo.gl/nXsTvH for more information about it.

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java.lang.SecurityException: Permission Denial: opening provider com.google.android.apps.docs.storagebackend.StorageBackendContentProvider from ProcessRecord{2769f52 8343:ca.rmen.android.poetassistant/u0a182} (pid=8343, uid=10182) requires android.permission.MANAGE_DOCUMENTS or android.permission.MANAGE_DOCUMENTS	at android.os.Parcel.readException(Parcel.java:1620)	at android.os.Parcel.readException(Parcel.java:1573)	at android.app.ActivityManagerProxy.getContentProvider(ActivityManagerNative.java:4240)	at android.app.ActivityThread.acquireProvider(ActivityThread.java:6391)	at android.app.ContextImpl$ApplicationContentResolver.acquireUnstableProvider(ContextImpl.java:2382)	at android.content.ContentResolver.acquireUnstableProvider(ContentResolver.java:1521)	at android.content.ContentResolver.openAssetFileDescriptor(ContentResolver.java:993)	at android.content.ContentResolver.openOutputStream(ContentResolver.java:751)	at ca.rmen.android.poetassistant.main.reader.PoemFile$2.doInBackground$d54f4d4(PoemFile.java:98)	at ca.rmen.android.poetassistant.main.reader.PoemFile$2.doInBackground(PoemFile.java:93)	at android.os.AsyncTask$2.call(AsyncTask.java:295)	at java.util.concurrent.FutureTask.run(FutureTask.java:237)	at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:234)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)	at java.lang.Thread.run(Thread.java:818)