If you have both TurboTax Business and a TurboTax personal income tax preparation program installed on your computer, open .tax2018 files after starting the program (i.e., open the file from within the program rather than clicking on the .tax2018 file itself).

I have done this and still am receiving the error. All other 2018 files are appearing om the menu, this one was prepared earlier and the program is not recognizing the return exists. The return is on my desktop.

How can I correct the error and open the tax return to amend as it printed out incorrectly from the start. I thought the program was right, it was not.

HOW

Do not open the return from the menu tiles ... click on the FILE tab in the upper left corner then search for the correct tax file if the program is trying to open the wrong one.