E-filed last year but says form preventing e-file this year. Does not tell me what form.

[Topper0024]

I E-filed last year and every year before that. This year it says there is a form preventing e-file and must mail it. Software not tell me what form is causing the issue. My return is nearly identical to last year. 

[Scott198043]

I am having the same problem when i add my schedule C

[Topper0024]

I switched to the "forms" view. I found forms that seemed to be residual from past years. I started deleting suspect forms that seemed irrelevant. I would run the check after each until the review went through and I could once again e-file. I still do not know what form did the trick, but it worked. Hope this helps someone