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Fatal error: Uncaught TypeError: call_user_func(): Argument #1 ($callback) must be a valid callback, function "blankslate_custom_pings" not found or invalid function name in /var/www/WebSites/www.mjsmide.se/wp-includes/class-walker-comment.php:183 Stack trace: #0 /var/www/WebSites/www.mjsmide.se/wp-includes/class-wp-walker.php(147): Walker_Comment->start_el() #1 /var/www/WebSites/www.mjsmide.se/wp-includes/class-walker-comment.php(139): Walker->display_element() #2 /var/www/WebSites/www.mjsmide.se/wp-includes/class-wp-walker.php(335): Walker_Comment->display_element() #3 /var/www/WebSites/www.mjsmide.se/wp-includes/comment-template.php(2391): Walker->paged_walk() #4 /var/www/WebSites/www.mjsmide.se/wp-content/themes/peekaboo/comments.php(33): wp_list_comments() #5 /var/www/WebSites/www.mjsmide.se/wp-includes/comment-template.php(1618): require('...') #6 /var/www/WebSites/www.mjsmide.se/wp-content/themes/peekaboo/single.php(11): comments_template() #7 /var/www/WebSites/www.mjsmide.se/wp-includes/template-loader.php(106): include('...') #8 /var/www/WebSites/www.mjsmide.se/wp-blog-header.php(19): require_once('...') #9 /var/www/WebSites/www.mjsmide.se/index.php(17): require('...') #10 {main} thrown in /var/www/WebSites/www.mjsmide.se/wp-includes/class-walker-comment.php on line 183