I got the error while writing a page. What caused the problem with me is that somewhere in the page I had written
to:
(so the three characters t, o and colon). I think WP interpreted it as some sort of command (not sure why), while it was just normal text. I solved the problem by changing the text to
to& #58;
& #58; being the HTML-code for the colon. Perhaps this will help anyone else to solve the matter.
(edit</i> there should not be a space between the ampersand and the hash-sign, but otherwise I can’t post the code here.)
