Failed to find configured root that contains

I'm getting the following error : ``` 05-29 01:08:02.924: E/AndroidRuntime(5447): FATAL EXCEPTION: IntentService[com.sample.muzeitest.MuzeiClass] 05-29 01:08:02.924: E/AndroidRuntime(5447): java.lang.IllegalArgumentException: Failed to find configured root that contains /data/data/com.sample.muzeitest/files/wallpaper0.png 05-29 01:08:02.924: E/AndroidRuntime(5447): at android.support.v4.content.FileProvider$SimplePathStrategy.getUriForFile(FileProvider.java:678) 05-29 01:08:02.924: E/AndroidRuntime(5447): at android.support.v4.content.FileProvider.getUriForFile(FileProvider.java:377) 05-29 01:08:02.924: E/AndroidRuntime(5447): at com.sample.muzeitest.MuzeiClass.muzeiContentUri(MuzeiClass.java:58) 05-29 01:08:02.924: E/AndroidRuntime(5447): at com.sample.muzeitest.MuzeiClass.onUpdate(MuzeiClass.java:37) 05-29 01:08:02.924: E/AndroidRuntime(5447): at com.google.android.apps.muzei.api.MuzeiArtSource.processAndDispatchSubscriberAdded(MuzeiArtSource.java:614) 05-29 01:08:02.924: E/AndroidRuntime(5447): at com.google.android.apps.muzei.api.MuzeiArtSource.processSubscribe(MuzeiArtSource.java:581) 05-29 01:08:02.924: E/AndroidRuntime(5447): at com.google.android.apps.muzei.api.MuzeiArtSource.onHandleIntent(MuzeiArtSource.java:539) 05-29 01:08:02.924: E/AndroidRuntime(5447): at android.app.IntentService$ServiceHandler.handleMessage(IntentService.java:65) 05-29 01:08:02.924: E/AndroidRuntime(5447): at android.os.Handler.dispatchMessage(Handler.java:99) 05-29 01:08:02.924: E/AndroidRuntime(5447): at android.os.Looper.loop(Looper.java:137) 05-29 01:08:02.924: E/AndroidRuntime(5447): at android.os.HandlerThread.run(HandlerThread.java:61) ``` When I try to use my `FileProvider` with the muzei app. I'm having an activity ( which adds some bitmaps from a drawable folder to the `/data/data/APP-SPACE-HERE/files/` ) and a class extending the `MuzeiArtSource` : ``` public class MuzeiClass extends MuzeiArtSource { Uri imgUri; public MuzeiClass() { super(MuzeiClass.class.getName()); } @Override public void onCreate() { super.onCreate(); // setUserCommands(BUILTIN_COMMAND_ID_NEXT_ARTWORK); // manual switch image } @Override protected void onUpdate(int arg0) { imgUri = muzeiContentUri(); publishArtwork(new Artwork.Builder() .imageUri( imgUri ) .title("Example image") .byline("Unknown person, c. 1980") // .viewIntent(new Intent(Intent.ACTION_VIEW, // Uri.parse("http://example"))) .build()); } public Uri muzeiContentUri() { File newFile = new File(getFilesDir(), "wallpaper0.png"); Uri contentUri = FileProvider.getUriForFile(getApplicationContext(), "com.sample.muzeitest.fileprovider", newFile); return contentUri; } } ``` Manifest file contains `provider` for `FileProvider` and `service` tags : ``` <service android:name="com.sample.muzeitest.MuzeiClass" android:label="@string/title_activity_muzei_service" android:description="@string/muzei_description" android:icon="@drawable/ic_source"> <intent-filter> <action android:name="com.google.android.apps.muzei.api.MuzeiArtSource" /> </intent-filter> <meta-data android:name="color" android:value="#fa0" /> </service> <provider android:name="android.support.v4.content.FileProvider" android:authorities="com.sample.muzeitest.fileprovider" android:exported="false" android:grantUriPermissions="true"> <meta-data android:name="android.support.FILE_PROVIDER_PATHS" android:resource="@xml/muzei_wallpapers" /> </provider> ``` I also have this xml file in `res/` folder : ``` <?xml version="1.0" encoding="utf-8"?> <paths xmlns:android="http://schemas.android.com/apk/res/android"> <files-path name="my_images" path="files/" /> </paths> ``` I made this question yesterday but the problem was about the uri name. I use `adb shell` to go the specified path `/data/data/com.sample.muzeitest/files/wallpaper0.png` and I can confirm that files are there saved. Read also some similar questions on SO but none helped.