PHP Code Error found in

\wp-content\plugins\coursepress\2.0\admin\controller\class-menu.php:113

$this is not accessible in static context. See http://www.brainbell.com/tutorials/php/Static_Methods.html

public static function init_tiny_mce_listeners( $init_array ) {
		$page = get_current_screen()->id;

		if ( $page == $this->slug ) {
			$init_array['height'] = '360px';
			$init_array['relative_urls'] = false;
			$init_array['url_converter'] = false;
			$init_array['url_converter_scope'] = false;

			$init_array['setup'] = 'function( ed ) {
				ed.on( \'keyup\', function( args ) {
					CoursePress.Events.trigger(\'editor:keyup\',ed);
				} );
			}';
		}