Fatal error: Uncaught TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, function "_wp_register_default_icon_collections" not found or invalid function name in /home/hammerst/public_html/bekhterev/wp-includes/class-wp-hook.php:353 Stack trace: #0 /home/hammerst/public_html/bekhterev/wp-includes/class-wp-hook.php(377): WP_Hook->apply_filters(NULL, Array) #1 /home/hammerst/public_html/bekhterev/wp-includes/plugin.php(523): WP_Hook->do_action(Array) #2 /home/hammerst/public_html/bekhterev/wp-settings.php(742): do_action('init') #3 /home/hammerst/public_html/bekhterev/wp-config.php(125): require_once('/home/hammerst/...') #4 /home/hammerst/public_html/bekhterev/wp-load.php(50): require_once('/home/hammerst/...') #5 /home/hammerst/public_html/bekhterev/wp-login.php(12): require('/home/hammerst/...') #6 {main} thrown in /home/hammerst/public_html/bekhterev/wp-includes/class-wp-hook.php on line 353