Fatal error: Uncaught TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, function "wpqa_custom_search_users" not found or invalid function name in /home/v/vaalimusic/fckup.ru/public_html/wp-includes/class-wp-hook.php:308 Stack trace: #0 /home/v/vaalimusic/fckup.ru/public_html/wp-includes/class-wp-hook.php(308): call_user_func_array('wpqa_custom_sea...', Array) #1 /home/v/vaalimusic/fckup.ru/public_html/wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters('', Array) #2 /home/v/vaalimusic/fckup.ru/public_html/wp-includes/plugin.php(565): WP_Hook->do_action(Array) #3 /home/v/vaalimusic/fckup.ru/public_html/wp-includes/class-wp-user-query.php(766): do_action_ref_array('pre_user_query', Array) #4 /home/v/vaalimusic/fckup.ru/public_html/wp-includes/class-wp-user-query.php(78): WP_User_Query->prepare_query(Array) #5 /home/v/vaalimusic/fckup.ru/public_html/wp-content/themes/discy/theme-parts/users.php(85): WP_User_Query->__construct(Array) #6 /home/v/vaalimusic/fckup.ru/public_html/wp-content/themes/discy/theme-parts/content.php(214): include('/home/v/vaalimu...') #7 /home/v/vaalimusic/fckup.ru/public_html/wp-content/themes/discy/theme-parts/loop.php(513): include('/home/v/vaalimu...') #8 /home/v/vaalimusic/fckup.ru/public_html/wp-content/themes/discy/template-users.php(6): include('/home/v/vaalimu...') #9 /home/v/vaalimusic/fckup.ru/public_html/wp-includes/template-loader.php(106): include('/home/v/vaalimu...') #10 /home/v/vaalimusic/fckup.ru/public_html/wp-blog-header.php(19): require_once('/home/v/vaalimu...') #11 /home/v/vaalimusic/fckup.ru/public_html/index.php(2): require('/home/v/vaalimu...') #12 {main} thrown in /home/v/vaalimusic/fckup.ru/public_html/wp-includes/class-wp-hook.php on line 308