s->id;
		return update_option( self::HIDDEN_OPTION, array_unique( $hidden ) );
	}

	/**
	 * Undo hiding of the task list.
	 *
	 * @return bool
	 */
	public function unhide() {
		$hidden = get_option( self::HIDDEN_OPTION, array() );
		$hidden = array_diff( $hidden, array( $this->hidden_id ? $this->hidden_id : $this->id ) );
		return update_option( self::HIDDEN_OPTION, $hidden );
	}

	/**
	 * Check if all viewable tasks are complete.
	 *
	 * @return bool
	 */
	public function is_complete() {
		$viewable_tasks = $this->get_viewable_tasks();

		return array_reduce(
			$viewable_tasks,
			function( $is_complete, $task ) {
				return ! $task->is_complete() ? false : $is_complete;
			},
			true
		);
	}

	/**
	 * Check if a task list has previously been marked as complete.
	 *
	 * @return bool
	 */
	public function has_previously_completed() {
		$complete = get_option( self::COMPLETED_OPTION, array() );
		return in_array( $this->get_list_id(), $complete, true );
	}

	/**
	 * Add task to the task list.
	 *
	 * @param Task $task Task class.
	 */
	public function add_task( $task ) {
		if ( ! is_subclass_of( $task, 'Automattic\WooCommerce\Admin\Features\OnboardingTasks\Task' ) ) {
			return new \WP_Error(
				'woocommerce_task_list_invalid_task',
				__( 'Task is not a subclass of `Task`', 'woocommerce' )
			);
		}
		if ( array_search( $task, $this->tasks, true ) ) {
			return;
		}

		$task_class_name                             = substr( get_class( $task ), strrpos( get_class( $task ), '\\' ) + 1 );
		$this->task_class_id_map[ $task_class_name ] = $task->get_id();
		$this->tasks[]                               = $task;
	}

	/**
	 * Get only visible tasks in list.
	 *
	 * @param string $task_id id of task.
	 * @return Task
	 */
	public function get_task( $task_id ) {
		return current(
			array_filter(
				$this->tasks,
				function( $task ) use ( $task_id ) {
					return $task->get_id() === $task_id;
				}
			)
		);
	}

	/**
	 * Get only visible tasks in list.
	 *
	 * @return array
	 */
	public function get_viewable_tasks() {
		return array_values(
			array_filter(
				$this->tasks,
				function( $task ) {
					return $task->can_view();
				}
			)
		);
	}

	/**
	 * Get task list sections.
	 *
	 * @return array
	 */
	public function get_sections() {
		return $this->sections;
	}

	/**
	 * Track list completion of viewable tasks.
	 */
	public function possibly_track_completion() {
		if ( ! $this->is_complete() ) {
			return;
		}

		if ( $this->has_previously_completed() ) {
			return;
		}

		$completed_lists   = get_option( self::COMPLETED_OPTION, array() );
		$completed_lists[] = $this->get_list_id();
		update_option( self::COMPLETED_OPTION, $completed_lists );
		$this->record_tracks_event( 'tasks_completed' );
	}

	/**
	 * Sorts the attached tasks array.
	 *
	 * @param array $sort_by list of columns with sort order.
	 * @return TaskList returns $this, for chaining.
	 */
	public function sort_tasks( $sort_by = array() ) {
		$sort_by = count( $sort_by ) > 0 ? $sort_by : $this->sort_by;
		if ( 0 !== count( $sort_by ) ) {
			usort(
				$this->tasks,
				function( $a, $b ) use ( $sort_by ) {
					return Task::sort( $a, $b, $sort_by );
				}
			);
		}
		return $this;
	}

	/**
	 * Prefix event for track event naming.
	 *
	 * @param string $event_name Event name.
	 * @return string
	 */
	public function prefix_event( $event_name ) {
		if ( null !== $this->event_prefix ) {
			return $this->event_prefix . $event_name;
		}
		return $this->get_list_id() . '_tasklist_' . $event_name;
	}

	/**
	 * Returns option to keep completed task list.
	 *
	 * @return string
	 */
	public function get_keep_completed_task_list() {
		return get_option( 'woocommerce_task_list_keep_completed', 'no' );
	}

	/**
	 * Remove reminder bar four weeks after store creation.
	 */
	public static function possibly_remove_reminder_bar() {
		$bar_hidden            = get_option( self::REMINDER_BAR_HIDDEN_OPTION, 'no' );
		$active_for_four_weeks = WCAdminHelper::is_wc_admin_active_for( WEEK_IN_SECONDS * 4 );

		if ( 'yes' === $bar_hidden || ! $active_for_four_weeks ) {
			return;
		}

		update_option( self::REMINDER_BAR_HIDDEN_OPTION, 'yes' );
	}

	/**
	 * Get the list for use in JSON.
	 *
	 * @return array
	 */
	public function get_json() {
		$this->possibly_track_completion();
		$tasks_json = array();
		foreach ( $this->tasks as $task ) {
			$json = $task->get_json();
			if ( $json['canView'] ) {
				$tasks_json[] = $json;
			}
		}

		return array(
			'id'                    => $this->get_list_id(),
			'title'                 => $this->title,
			'isHidden'              => $this->is_hidden(),
			'isVisible'             => $this->is_visible(),
			'isComplete'            => $this->is_complete(),
			'tasks'                 => $tasks_json,
			'eventPrefix'           => $this->prefix_event( '' ),
			'displayProgressHeader' => $this->display_progress_header,
			'keepCompletedTaskList' => $this->get_keep_completed_task_list(),
			'sections'              => array_map(
				function( $section ) {
					return $section->get_json();
				},
				$this->sections
			),
		);
	}
}
<br />
<b>Fatal error</b>:  Uncaught Error: Class 'Automattic\WooCommerce\Admin\Features\OnboardingTasks\TaskList' not found in /home/hvshopir/public_html/wp-content/plugins/woocommerce/src/Admin/Features/OnboardingTasks/TaskLists.php:322
Stack trace:
#0 /home/hvshopir/public_html/wp-content/plugins/woocommerce/src/Admin/Features/OnboardingTasks/TaskLists.php(125): Automattic\WooCommerce\Admin\Features\OnboardingTasks\TaskLists::add_list(Array)
#1 /home/hvshopir/public_html/wp-content/plugins/woocommerce/src/Admin/Features/OnboardingTasks/TaskLists.php(70): Automattic\WooCommerce\Admin\Features\OnboardingTasks\TaskLists::init_default_lists()
#2 /home/hvshopir/public_html/wp-content/plugins/woocommerce/src/Admin/Features/OnboardingTasks/Init.php(43): Automattic\WooCommerce\Admin\Features\OnboardingTasks\TaskLists::init()
#3 /home/hvshopir/public_html/wp-content/plugins/woocommerce/src/Admin/Features/Features.php(139): Automattic\WooCommerce\Admin\Features\OnboardingTasks\Init-&gt;__construct()
#4 /home/hvshopir/public_html/wp-includes/class in <b>/home/hvshopir/public_html/wp-content/plugins/woocommerce/src/Admin/Features/OnboardingTasks/TaskLists.php</b> on line <b>322</b><br />