Do you have any PDF attachments entered on General > Electronic Filing > e-file PDF/Miscellaneous > e-file Attachment? If so, make sure none of them have entries to send with a return you're not filing, like Federal 4720 or a Michigan City return.

If you do have PDFs attached but all your entries look correct already, sometimes totally deleting them by pressing the X next to the PDF name at the top, and re-uploading can resolve underlying issues causing transmission failures. 

If you don't have any PDFs or the above steps don't resolve, please reach out to support by phone or chat so we can take a look at your particular return and identify the root cause of the error so you can e-file.

- Rebecca