{"id":14699774,"date":"2021-07-26T00:58:55","date_gmt":"2021-07-26T00:58:55","guid":{"rendered":"https:\/\/wordpress.org\/support\/topic\/php8-error-3\/"},"modified":"2021-07-26T00:58:55","modified_gmt":"2021-07-26T00:58:55","slug":"php8-error-3","status":"publish","type":"topic","link":"https:\/\/wordpress.org\/support\/topic\/php8-error-3\/","title":{"rendered":"PHP8 Error"},"content":{"rendered":"<p>Fatal error: Uncaught TypeError: call_user_func_array(): Argument #1 ($function) must be a valid callback, class InboxWebmail_Helper_Upgrade does not have a method &#8220;upgrade&#8221; in \/var\/www\/vhosts\/example.com\/httpdocs\/wp-includes\/class-wp-hook.php:303 Stack trace: #0 \/var\/www\/vhosts\/example.com\/httpdocs\/wp-includes\/class-wp-hook.php(327): WP_Hook-&gt;apply_filters() #1 \/var\/www\/vhosts\/example.com\/httpdocs\/wp-includes\/plugin.php(470): WP_Hook-&gt;do_action() #2 \/var\/www\/vhosts\/example.com\/httpdocs\/wp-admin\/plugins.php(193): do_action() #3 {main} thrown in \/var\/www\/vhosts\/example.com\/httpdocs\/wp-includes\/class-wp-hook.php on line 303<\/p>\n","protected":false},"template":"","class_list":["post-14699774","topic","type-topic","status-publish","hentry"],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/wordpress.org\/support\/wp-json\/wp\/v2\/topic\/14699774","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\/14699774\/revisions"}],"wp:attachment":[{"href":"https:\/\/wordpress.org\/support\/wp-json\/wp\/v2\/media?parent=14699774"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}