Hello, I know that is an old post but I wanted to give my solution to you, just in case someone is having the same problem. What I did? I solved this by using phpmyadmin. NOTE: I use mysql as database, check what database you are using. First locate your database and then the table cms_posts, run this SQL to find the pages of the website. NOTE:I use as a table prefix "wp_" yours could be different. Find the page and remove the post_title.
SELECT * FROM
post_type = 'page'