Migrating to Unity5
If you haven't used Android Native with the previous Unity versions, you have nothing to worry about, no additional actions required, you can just Install the plugin.
If you switched your project to the Unity 5+. Make sure you have Android Native v6.2 or higher.
Open plugin Settings and click Reinstall button under the Actions menu. As showed on the screenshot bellow
And remove following folders from your project:
- Assets/Plugins/Android/facebook/bin/classes
