Problems moving Blogspot blog articles to WordPress.org

Hello, I have a Blogspot blog at http://www.koshlandgarden.blogspot.com/ that I would like to move over to my WordPress.org blog. I already exported an XML file from Blogspot, but then ran into some issue when I tried to import the file over to WordPress at http://communitygrows.com. When I tried authorizing the import, I receive this message:

The page you have requested cannot be displayed. Another site was requesting access to your Google Account, but sent a malformed request. Please contact the site that you were trying to use when you received this message to inform them of the error. A detailed error message follows:

The site “http://communitygrows.org” has not been registered.

What should I do next?