Sounds like you may have made an entry in the personal information section indicating you have a spouse. Have you reviewed that section again to be sure?

The section says I am single.

If it says you are single, it shouldn't trigger anything for a spouse.  Are you able to skip it?  If not, try this and see if this clears the issue for you.  Please log completely out of TurboTax.  Then, in your browser, please clear your cache and delete your cookies.  After this, close completely out of the browser.  Re-open everything including logging back into TurboTax.  

For further instructions on how to clear cache and delete cookies, please see the links below:

Clear Cache

Delete Cookies

I cleared the cache, deleted cookies, and closed and open the browser; however, I am still receiving this error message

Please follow the instructions in this TurboTax FAQ to contact customer support in order for us to assist you with this issue:  What is the TurboTax phone number?