Importing from Blogspot

I’m trying to import my blog from blogspot, and it is coming up with 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 “https://*mydomainname*.com” has not been registered.”

changing in mydomainname with my actual domain name.

i have verified it by adding the html file to the site and when i log into my google account i can see both my blogspot website and other website.

i have a lot of posts and comments i need to import and have been struggling for a while.

Ben