The URL Field default value of " http://" causes an error if the URL field is left blank when creating a listing. If you leave the URL field blank when creating a listing, this error is produced "Site URL is incorrect." I fixed this by deleting the URL field default value in the admin panel. It's a fine fix for me. I'm okay with leaving the field default value blank. Just thought the Subrion team and anybody else encountering the problem should know.