error/moodle/contentArray
From MoodleDocs
Error messages generate a wiki page on-the-fly apparently. I had incorrectly passed parameters to the error handler print_error() which included a text string 'content' concatenated with a value that was an array not a string, hence Array was appended to 'content' within the scope of an 'error' in 'moodle', hence the wiki page error/moodle/contentArray was created. Once I had created the page, there is no delete option. Someone might want to delete this...... ;-)
