WP comments form not submitting

I am using a custom theme that I purchased and has been modified. As far as I know, the comments section was not touched. However, I am getting an error when I try to submit a comment. It take me to a page stating "Desktop server built on xampp". See here.

I am doing this on a live site. I can provide ftp access if you would like to take a peek at my comments.php file.

Please let me know if you can help me with this.