{"id":19006030,"date":"2026-08-29T05:15:38","date_gmt":"2026-08-29T05:15:38","guid":{"rendered":"https:\/\/wordpress.org\/support\/topic\/fatal-error-call_user_func_array-2\/"},"modified":"2026-08-29T05:15:38","modified_gmt":"2026-08-29T05:15:38","slug":"fatal-error-call_user_func_array-2","status":"publish","type":"topic","link":"https:\/\/wordpress.org\/support\/topic\/fatal-error-call_user_func_array-2\/","title":{"rendered":"Fatal error: call_user_func_array():"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Hi. I recently updated all my plugins. Following that I updated to the latest version of WordPress (7.1). After the update I am unable to login and I receive the message below. I have replaced my wp-admin and wp-includes folders and I have disabled all of my plugins, but I still receive the following message.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Any help on getting the site back up is greatly appreciated. I have access to Plesk and PHPMyAdmin.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Thank you!<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Fatal error<\/strong>: Uncaught TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, function &#8220;_wp_register_default_icon_collections&#8221; not found or invalid function name in G:\\PleskVhosts\\robinmeadows.com\\httpdocs\\wp-includes\\class-wp-hook.php:353 Stack trace: #0 G:\\PleskVhosts\\robinmeadows.com\\httpdocs\\wp-includes\\class-wp-hook.php(377): WP_Hook-&gt;apply_filters() #1 G:\\PleskVhosts\\robinmeadows.com\\httpdocs\\wp-includes\\plugin.php(523): WP_Hook-&gt;do_action() #2 G:\\PleskVhosts\\robinmeadows.com\\httpdocs\\wp-settings.php(771): do_action() #3 G:\\PleskVhosts\\robinmeadows.com\\httpdocs\\wp-config.php(78): require_once(&#8216;&#8230;&#8217;) #4 G:\\PleskVhosts\\robinmeadows.com\\httpdocs\\wp-load.php(50): require_once(&#8216;&#8230;&#8217;) #5 G:\\PleskVhosts\\robinmeadows.com\\httpdocs\\wp-blog-header.php(13): require_once(&#8216;&#8230;&#8217;) #6 G:\\PleskVhosts\\robinmeadows.com\\httpdocs\\index.php(17): require(&#8216;&#8230;&#8217;) #7 {main} thrown in\u00a0<strong>G:\\PleskVhosts\\robinmeadows.com\\httpdocs\\wp-includes\\class-wp-hook.php<\/strong>\u00a0on line\u00a0<strong>353<\/strong><\/p>\n","protected":false},"template":"","class_list":["post-19006030","topic","type-topic","status-publish","hentry","topic-tag-call_user_func_array","topic-tag-fatal-error"],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/wordpress.org\/support\/wp-json\/wp\/v2\/topic\/19006030","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wordpress.org\/support\/wp-json\/wp\/v2\/topic"}],"about":[{"href":"https:\/\/wordpress.org\/support\/wp-json\/wp\/v2\/types\/topic"}],"version-history":[{"count":0,"href":"https:\/\/wordpress.org\/support\/wp-json\/wp\/v2\/topic\/19006030\/revisions"}],"wp:attachment":[{"href":"https:\/\/wordpress.org\/support\/wp-json\/wp\/v2\/media?parent=19006030"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}