Please see the link below. You will need to mail in your Form 8949 only if you are prompted to. Do not attach the forms to your tax return that is being submitted to electronic filing.
Do I need to mail in Form 8949?
I would recommend removing the attachment and then trying to electronic file again.
If you are still having issues, you will need to switch to mailing your return in order to file them on time.
Switch from E-file to mail
@mkielm
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