wordpress site down with error code relating to the themify theme

Please see the error code below, need wordpress site back up looking like it normally does as quickly as possible p /** * Post API: Walker_Page class * * @package WordPress * @subpackage Template * @since 4.4.0 */ /** * Core walker class used to create an HTML list of pages. * * @since 2.1.0 * * @see Walker */ class Walker_Page extends Walker { /** * What the class handles. * * @since 2.1.0 * @access public * @var string * * @see Walker::$tree_type */ public $tree_type = 'page'; /** * Database fields to use. * * @since 2.1.0 * @access private * @var array * * @see Walker::$db_fields * @todo Decouple this. */ public $db_fields = array( 'parent' => 'post_parent', 'id' => 'ID' ); /** * Outputs the beginning of the current level in the tree before elements are output. * * @since 2.1.0 * @access public * * @see Walker::start_lvl() * * @param string $output Passed by reference. Used to append additional content. * @param int $depth Optional. Depth of page. Used for padding. Default 0. * @param array $args Optional. Arguments for outputting the next level. * Default empty array. */ public function start_lvl( &$output, $depth = 0, $args = array() ) { if ( isset( $args['item_spacing'] ) && 'preserve' === $args['item_spacing'] ) { $t = "\t"; $n = "\n"; } else { $t = ''; $n = ''; } $indent = str_repeat( $t, $depth ); $output .= "{$n}{$indent} {$n}"; } /** * Outputs the end of the current level in the tree after elements are output. * * @since 2.1.0 * @access public * * @see Walker::end_lvl() * * @param string $output Passed by reference. Used to append additional content. * @param int $depth Optional. Depth of page. Used for padding. Default 0. * @param array $args Optional. Arguments for outputting the end of the current level. * Default empty array. */ public function end_lvl( &$output, $depth = 0, $args = array() ) { if ( isset( $args['item_spacing'] ) && 'preserve' === $args['item_spacing'] ) { $t = "\t"; $n = "\n"; } else { $t = ''; $n = ''; } $indent = str_repeat( $t, $depth ); $output .= "{$indent} {$n}"; } /** * Outputs the beginning of the current element in the tree. * * @see Walker::start_el() * @since 2.1.0 * @access public * * @param string $output Used to append additional content. Passed by reference. * @param WP_Post $page Page data object. * @param int $depth Optional. Depth of page. Used for padding. Default 0. * @param array $args Optional. Array of arguments. Default empty array. * @param int $current_page Optional. Page ID. Default 0. */ public function start_el( &$output, $page, $depth = 0, $args = array(), $current_page = 0 ) { if ( isset( $args['item_spacing'] ) && 'preserve' === $args['item_spacing'] ) { $t = "\t"; $n = "\n"; } else { $t = ''; $n = ''; } if ( $depth ) { $indent = str_repeat( $t, $depth ); } else { $indent = ''; } $css_class = array( 'page_item', 'page-item-' . $page->ID ); if ( isset( $args['pages_with_children'][ $page->ID ] ) ) { $css_class[] = 'page_item_has_children'; } if ( ! empty( $current_page ) ) { $_current_page = get_post( $current_page ); if ( $_current_page && in_array( $page->ID, $_current_page->ancestors ) ) { $css_class[] = 'current_page_ancestor'; } if ( $page->ID == $current_page ) { $css_class[] = 'current_page_item'; } elseif ( $_current_page && $page->ID == $_current_page->post_parent ) { $css_class[] = 'current_page_parent'; } } elseif ( $page->ID == get_option('page_for_posts') ) { $css_class[] = 'current_page_parent'; } /** * Filters the list of CSS classes to include with each page item in the list. * * @since 2.8.0 * * @see wp_list_pages() * * @param array $css_class An array of CSS classes to be applied * to each list item. * @param WP_Post $page Page data object. * @param int $depth Depth of page, used for padding. * @param array $args An array of arguments. * @param int $current_page ID of the current page. */ $css_classes = implode( ' ', apply_filters(