I had a similar thing happened.
I would open my footer.php with wordpad and deleted <?php include_once(‘/home/yourdirectory.goeshere/wp-content/plugins/theme-inc.php’); ?> Save the file and upload via your FTP client. I would just rename your footer1.php that case you have the original just in case, then put your edited version in place under your themes directory.
Deleting the code for me did not affect my footer or site at all(least that i know off).
I don’t see the error on your page so maybe you fixed it already, well, hope that helped.
