Thank you Otto!! I really appreciate your help.
But how do I do a manual update, when I cannot access the wp-admin site?
Thank you! – but no, I haven’t done anything recently.. and now unfortunately I can’t even access the wp-admin site / backend, where I can edit content and setup, so I can’t follow your advice… I get the same error message (and nothing else) on both the website frontend and wp-admin.
