[Resolved] Botched upgrade, ‘fatal error’ message.
I upgraded from an older version of WP to the latest version, but when I try to access the /wp-admin/install.php page, I get the following error message: Fatal error: Class walker_category_checklist: Cannot inherit from undefined class walker in /homepages/44/d162186939/htdocs/dcs/wp-admin/includes/template.php on line 125
I now cannot access my dashboard, and am not sure what to do. My site does show up, so nothing has been lost, but I am not sure what to do next. Any advice gratefully appreciated!
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