Think the file at wordpress is not good anymore
several files contain:
<?php
# /*
# Plugin Name: Tweet old post
# Plugin URI: https://www.ajaymatharu.com/wordpress-plugin-tweet-old-posts/
# Description: Plugin for tweeting your old posts randomly
# Author: Ajay Matharu
<<<<<<< .mine
# Version: 3.2.3
=======
# Version: 3.2.2
>>>>>>> .r423856
# Author URI: https://www.ajaymatharu.com
# */
And check top-core.php it has several errors