public function output_errors() {
		$errors = array_filter( (array) get_option( 'woocommerce_meta_box_errors' ) );

		if ( ! empty( $errors ) ) {

			echo '<div id="woocommerce_errors" class="error notice is-dismissible">';

			foreach ( $errors as $error ) {
				echo '<p>' . wp_kses_post( $error ) . '</p>';
			}

			echo '</div>';

			// Clear.
			delete_option( 'woocommerce_meta_box_errors' );
		}
	}