Is this the same issue? https://proconnect.intuit.com/community/lacerte-discussions/discussion/texas-franchise/01/75129#M145...

"This happens only with the 1040 Individual return if you have not put the TX Web file number in the NEW LOCATION. (Screen 54.431)  In the detail tab for TX Franchise (State & Local Screen 54.) the first page Texas Miscellaneous on left tool bar scroll down and there is another place to put the Web file number.  If you put in on the new screen you will not receive the error and it will file. "