No Importable vCard error with Contacts

Some websites with vCards will generate an error in Contacts. The error is:

"No cards added: No importable cards were found."

I downloaded two cards, one that would import correctly, one that would not.

These can be opened with emacs or with the TextEdit application.

The difference was that the card that would generate the error message had no "END:VCARD" at the end of its file.

After adding "END:VCARD" at the end, it imported OK.