Export broken

When I try to export my blog to have a back up file I get this message:

This webpage is not found
No webpage was found for the web address: http://www.craftylife.net/wp-admin/export.php?download=true&content=all&cat=0&post_author=0&post_start_date=0&post_end_date=0&post_status=0&page_author=0&page_start_date=0&page_end_date=0&page_status=0&submit=Download+Export+File
Error 6 (net::ERR_FILE_NOT_FOUND): The file or directory could not be found.

Any idea what could have happened?

Please note I am not a coder. I know how to run WP effectively but talk to me like a toddler when explaining.