FileProvider找不到配置的根目录，该根目录包含...错误

<provider
    android:name="androidx.core.content.FileProvider"
    android:authorities="com.example.fileprovider"
    android:exported="false"
    android:grantUriPermissions="true">
    <meta-data
        android:name="android.support.FILE_PROVIDER_PATHS"
        android:resource="@xml/file_paths" />
</provider>

<paths>
    <root-path
        name="root"
        path="" />
</paths>

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

File file = new File(getExternalFilesDir(Environment.DIRECTORY_PICTURES), "example.jpg");
Uri fileUri = FileProvider.getUriForFile(this, "com.example.fileprovider", file);