I am seeing the same and have isolated the problem to the WPBakery Page Builder plugin. Disable that, and the error disappears.
I expect this to be a temporary server issue on their side, so it will probably go away again.
I guess I didn’t explain myself clearly: The links that are shown (“Blog” , “Velkommen – Bienvenido” and “admin”) are all links that I have hardcoded into sidebar.php.
What I wanted – and what used to work – was to have all my WordPress pages listed after “Velkommen” and above “admin”, thus I have put the wp_list_pages function in, but it doesn’t generate any content.
I have a handful of WordPress pages that should show up there (e.g. http://www.spanskfilmforum.dk/kontakt/), but they don’t – somehow the wp_list_pages cannot find them …?
