> Concerned user's capabilities.
	 */
	public function filter_user_has_cap( array $user_caps, array $required_caps, array $args, WP_User $user ) {
		if ( 'view_query_monitor' !== $args[0] ) {
			return $user_caps;
		}

		if ( array_key_exists( 'view_query_monitor', $user_caps ) ) {
			return $user_caps;
		}

		if ( ! is_multisite() && user_can( $args[1], 'manage_options' ) ) {
			$user_caps['view_query_monitor'] = true;
		}

		return $user_caps;
	}

	/**
	 * @return void
	 */
	public function action_plugins_loaded() {
		// Hide QM itself from output by default:
		if ( ! defined( 'QM_HIDE_SELF' ) ) {
			define( 'QM_HIDE_SELF', true );
		}

		/**
		 * Filters the collectors that are being added.
		 *
		 * @since 2.11.2
		 *
		 * @param array<int, QM_Collector> $collectors Array of collector instances.
		 * @param QueryMonitor             $instance   QueryMonitor instance.
		 */
		foreach ( apply_filters( 'qm/collectors', array(), $this ) as $collector ) {
			QM_Collectors::add( $collector );
		}

		# Load dispatchers:
		foreach ( (array) glob( $this->plugin_path( 'dispatchers/*.php' ) ) as $file ) {
			include_once $file;
		}

		/**
		 * Filters the dispatchers that are being added.
		 *
		 * @since 2.11.2
		 *
		 * @param array<int, QM_Dispatcher> $dispatchers Array of dispatcher instances.
		 * @param QueryMonitor              $instance    QueryMonitor instance.
		 */
		foreach ( apply_filters( 'qm/dispatchers', array(), $this ) as $dispatcher ) {
			QM_Dispatchers::add( $dispatcher );
		}

	}

	/**
	 * @return void
	 */
	public function action_init() {
		load_plugin_textdomain( 'query-monitor', false, dirname( $this->plugin_base() ) . '/languages' );
	}

	/**
	 * @return void
	 */
	public static function symlink_warning() {
		$db = WP_CONTENT_DIR . '/db.php';
		trigger_error( sprintf(
			/* translators: %s: Symlink file location */
			esc_html__( 'The symlink at %s is no longer pointing to the correct location. Please remove the symlink, then deactivate and reactivate Query Monitor.', 'query-monitor' ),
			'<code>' . esc_html( $db ) . '</code>'
		), E_USER_WARNING );
	}

	/**
	 * Registers the Query Monitor user capability group for the Members plugin.
	 *
	 * @link https://wordpress.org/plugins/members/
	 *
	 * @return void
	 */
	public function action_register_members_groups() {
		members_register_cap_group( 'query_monitor', array(
			'label' => __( 'Query Monitor', 'query-monitor' ),
			'caps' => array(
				'view_query_monitor',
			),
			'icon' => 'dashicons-admin-tools',
			'priority' => 30,
		) );
	}

	/**
	 * Registers the View Query Monitor user capability for the Members plugin.
	 *
	 * @link https://wordpress.org/plugins/members/
	 *
	 * @return void
	 */
	public function action_register_members_caps() {
		members_register_cap( 'view_query_monitor', array(
			'label' => _x( 'View Query Monitor', 'Human readable label for the user capability required to view Query Monitor.', 'query-monitor' ),
			'group' => 'query_monitor',
		) );
	}

	/**
	 * Registers the Query Monitor user capability group for the User Role Editor plugin.
	 *
	 * @link https://wordpress.org/plugins/user-role-editor/
	 *
	 * @param array<string, array<string, mixed>> $groups Array of existing groups.
	 * @return array<string, array<string, mixed>> Updated array of groups.
	 */
	public function filter_ure_groups( array $groups ) {
		$groups['query_monitor'] = array(
			'caption' => esc_html__( 'Query Monitor', 'query-monitor' ),
			'parent' => 'custom',
			'level' => 2,
		);

		return $groups;
	}

	/**
	 * Registers the View Query Monitor user capability for the User Role Editor plugin.
	 *
	 * @link https://wordpress.org/plugins/user-role-editor/
	 *
	 * @param array<string, array<int, string>> $caps Array of existing capabilities.
	 * @return array<string, array<int, string>> Updated array of capabilities.
	 */
	public function filter_ure_caps( array $caps ) {
		$caps['view_query_monitor'] = array(
			'custom',
			'query_monitor',
		);

		return $caps;
	}

	/**
	 * @return void
	 */
	public function action_cease() {
		// iterate collectors, call tear_down
		// discard all collected data
		QM_Collectors::cease();

		// remove dispatchers or prevent them from doing anything
		QM_Dispatchers::cease();
	}

	/**
	 * @param string $file
	 * @return self
	 */
	public static function init( $file = null ) {

		static $instance = null;

		if ( ! $instance ) {
			$instance = new QueryMonitor( $file );
		}

		return $instance;

	}

}
<br />
<b>Fatal error</b>:  Uncaught Error: Class 'QueryMonitor' not found in /home/mrfilame/public_html/wp-content/plugins/query-monitor/query-monitor.php:93
Stack trace:
#0 /home/mrfilame/public_html/wp-settings.php(428): include_once()
#1 /home/mrfilame/public_html/wp-config.php(96): require_once('/home/mrfilame/...')
#2 /home/mrfilame/public_html/wp-load.php(50): require_once('/home/mrfilame/...')
#3 /home/mrfilame/public_html/wp-blog-header.php(13): require_once('/home/mrfilame/...')
#4 /home/mrfilame/public_html/index.php(17): require('/home/mrfilame/...')
#5 {main}
  thrown in <b>/home/mrfilame/public_html/wp-content/plugins/query-monitor/query-monitor.php</b> on line <b>93</b><br />