That error is related to the 'joint-occupancy' part of the home energy credit. Joint Occupancy does not refer to Married filing Jointly. It refers to sharing the credit with someone else who is also filing a tax return to take the credit.
In order to file right now you need to uncheck the box at the top of the form that refers to joint occupancy.
In the desktop program go to forms mode and manually uncheck the box at the top of form 5695.
In the online program clear your cache and cookies and then go through the step by step for the residential energy credit again and say 'no' to the question on joint occupancy.
If you actually are sharing the credit with someone else who is filing the form then the IRS will not be accepting this form for joint occupancy until at least March 27th. So you can wait until then to file or you can print and mail in your tax return.
Here is another thread with information on this issue.
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