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Update, I found an issue … now I see:
Warning: require_once(/homepages/44/d900152786/htdocs/wp-includes/class-wp-textdomain-registry.php): failed to open stream: No such file or directory in /homepages/44/d900152786/htdocs/wp-settings.php on line 155
Fatal error: require_once(): Failed opening required ‘/homepages/44/d900152786/htdocs/wp-includes/class-wp-textdomain-registry.php’ (include_path=’.:/usr/lib/php7.4′) in /homepages/44/d900152786/htdocs/wp-settings.php on line 155
So, the class-wp-textdomain-registry.php is missing … can anybody tell me what kind of document it is?