There could be a couple reasons. Most likely you didn't verify your link within 3 days.
If it hasn't been more than 3 days since you submitted your link then the line that included the verification link was wrapped in your email. Instead of clicking on the verification link Copy the COMPLETE URL and paste it in your browser.
You might have spammed us with many links to your web site. Spammers get deleted.
Your web site might have failed our link checking software.
Web sites that have not been verified within 3 days are automatically be deleted.
If you think you shouldn't have gotten this error please contact us.