What do you mean, it was "rejected"? If you e-filed an original return, and then e-filed an amended return, the AGI you used (from the previous year) would not have changed.
How did you file originally and why are you trying to amend?
If you are correct, that you should be filing a joint return, and you need to amend it, but it is being rejected, simply print the amended return, sign form 1040-X and form 1040, and mail it to the IRS.
