Error extending FileProvider

I need to use 2 file providers for my app.

I have tried the quick fix suggested in this answer:

https://stackoverflow.com/a/42989182/7952427

But the app crashes.

I know that the second provider is causing this exception/crash because when i remove it, the app doesn't crash anymore.

In Manifest:

<provider
  android:name="android.support.v4.content.FileProvider"
        android:authorities="com.example.android.fileproviderTestLyb"
        android:exported="false"
        android:grantUriPermissions="true">
        <meta-data
            android:name="android.support.FILE_PROVIDER_PATHS"
            android:resource="@xml/file_paths">
        </meta-data>
    </provider>
    <provider
        android:name=".MyFileProvider"
        android:authorities="com.example.android.fileprovider2"
        android:exported="false"
        android:grantUriPermissions="true">
        <meta-data
            android:name="android.support.FILE_PROVIDER_PATHS_video"
            android:resource="@xml/video_path">
        </meta-data>
    </provider>

The File Provider class:

import android.support.v4.content.FileProvider;
public class MyFileProvider  extends FileProvider{
}

Can anyone help me understand why? Do i need to add something to MyFileProvider class?