올려주신 내용으로는 원인을 모르겠군요;;

워드프레스 디버그 모드를 활성화 해서 어떤 오류 메시지가 나오는지도 봐보세요.

워드프레스의 wp-config.php 파일에서

define('WP_DEBUG', false); -> define('WP_DEBUG', true);

이렇게 수정해주시면 디버그 모드가 활성화 됩니다.

오류 내용도 올려주세요~

참고로, 차일드 테마의 style.css 파일에는 아래 정보만 있어도 됩니다.

/* 
Theme Name: Child of TheBuilt
Template: thebuilt
*/

답변감사합니다

디버그확인해 보니 아래와같이 뜨는데요

뭘 수정해야할까요?

[24-Jan-2017 06:46:41] PHP Notice:  Trying to get property of non-object in /home/hosting_users/ss4588/www/wp-content/plugins/thebuilt-theme-addons/inc/shortcodes/visual-composer/vc-row-custom.php on line 8
[24-Jan-2017 06:46:41] PHP Notice:  Trying to get property of non-object in /home/hosting_users/ss4588/www/wp-content/plugins/thebuilt-theme-addons/inc/shortcodes/visual-composer/vc-row-custom.php on line 16
[24-Jan-2017 06:46:41] PHP Notice:  Trying to get property of non-object in /home/hosting_users/ss4588/www/wp-content/plugins/thebuilt-theme-addons/inc/shortcodes/visual-composer/vc-row-custom.php on line 17
[24-Jan-2017 06:46:41] PHP Notice:  Trying to get property of non-object in /home/hosting_users/ss4588/www/wp-content/plugins/thebuilt-theme-addons/inc/shortcodes/visual-composer/vc-row-custom.php on line 18
[24-Jan-2017 06:46:41] PHP Notice:  Undefined property: KBContentList::$resource in /home/hosting_users/ss4588/www/wp-content/plugins/kboard/class/KBContentList.class.php on line 211
[24-Jan-2017 06:46:43] PHP Notice:  Trying to get property of non-object in /home/hosting_users/ss4588/www/wp-content/plugins/thebuilt-theme-addons/inc/shortcodes/visual-composer/vc-row-custom.php on line 8
[24-Jan-2017 06:46:43] PHP Notice:  Trying to get property of non-object in /home/hosting_users/ss4588/www/wp-content/plugins/thebuilt-theme-addons/inc/shortcodes/visual-composer/vc-row-custom.php on line 16
[24-Jan-2017 06:46:43] PHP Notice:  Trying to get property of non-object in /home/hosting_users/ss4588/www/wp-content/plugins/thebuilt-theme-addons/inc/shortcodes/visual-composer/vc-row-custom.php on line 17
[24-Jan-2017 06:46:43] PHP Notice:  Trying to get property of non-object in /home/hosting_users/ss4588/www/wp-content/plugins/thebuilt-theme-addons/inc/shortcodes/visual-composer/vc-row-custom.php on line 18

========

아래는 해당 vc-row-custom.php 파일소스입니다

<?php

// VC [vc_row] - Onepage location feature
$locations = get_nav_menu_locations();

if($locations) {
    $menu = wp_get_nav_menu_object( $locations[ 'primary' ] );
    $menu_items = wp_get_nav_menu_items($menu->term_id);
} else {
    $menu_items = Array();
}

$onepage_menu_items_arr["-- Don't use this Row as Onepage section --"] = "0";

foreach ( (array) $menu_items as $key => $menu_item ) {
    $title = esc_html($menu_item->title);
    $url = $menu_item->url;
    $onepage = esc_html($menu_item->onepage);

    if($onepage == 'on') {
        $onepage_menu_items_arr[$title] = esc_url($menu_item->url);
    }
}

$attributes = array(
    'type' => 'dropdown',
    'heading' => "Use as Onepage section",
    'param_name' => 'row_onepage_id',
    'value' => $onepage_menu_items_arr,
    'std' => "0",
    'description' => "Select link from main menu that will scroll down page to this Row content. This link should be checked as Onepage link in 'Appearance > Menus' first."
);

vc_add_param( 'vc_row', $attributes );

글쎄요. PHP Notice는 오류라기보단 알림에 가까워서 크게 문제가 되지는 않을겁니다.

PHP Notice 문제는 테마 제작자에게 문의를 해보셔야 할 듯합니다.

차일드 테마가 망가졌다는 문제는 다른 문제 같군요.

차일드 테마 파일중 불필요한 파일을 제거하고, 처음부터 하나하나 체크 해보셔야 할 듯하군요.