I am getting this error 

Duplicate Social Security Number: a tax return with the same Social Security number has already been submitted-in other words, it appears you are trying to submit the same return twice. If you need to change this return you will need to file an amended return by paper, in the mail.

Then below it it says:

Not transmitted. The first extension failed the tax submission first extension validation step . Please make the necessary corrections.

The first time it failed transmission due to the freeze box not checked. On the Screen it says marked for electronic filing. How do I fix this?