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[#1]

The following diagnostic is generating: Form 1040: Form 1040-X is included in this return. This return must be e-filed as an amended return. Please use E-file Amendment options in the File Return.

[Critchiecpa]

I figured out how to clear this!  You just uncheck the e-file boxes for the 1040.  The diagnostic doesn't really say what the problem is.  But that is how I cleared it.

[pamdory]

Was it an amended return?  

Amended returns just use a different filing option on the e-file menu.  If you click on E-File in the upper bar you'll see it about halfway down in the dropdown menu.