http 500 error after plugin is activated in multisite

Yeah. That was the first thing as well as a reinstall.
Both didn’t work.

[14-Jan-2019 20:37:08 UTC] PHP Fatal error: Class ‘Orbit_Fox_Module_Abstract’ not found in /var/www/wordpress/init.php on line 15

It’s the same although the plugin is removed/uninstalled in the entire multisite network.

The file is directly inside the wordpress root folder.

Here is the snippet:

    10	define( 'BEAVER_WIDGETS_URL', plugins_url( '/', __FILE__ ) );
    11	
    12	/**
    13	 * Class Beaver_Widgets_OBFX_Module
    14	 */
    15	class Beaver_Widgets_OBFX_Module extends Orbit_Fox_Module_Abstract {
    16	
    17		/**
    18		 * Beaver_Widgets_OBFX_Module constructor.
    19		 *
    20		 * @since   2.2.5
    21		 * @access  public
    22		 */