The prior year tax data file from the TurboTax Business Edition cannot be transferred to one of the current year TurboTax Personal editions, eg. Business Edition to Premier Edition

Or do you mean from the personal Home & Business version?

Could you have transferred from the wrong file? See if you have another .tax2017 file on your computer. Or maybe last year you marked the Schedule C as FINAL in Turbo Tax? Or the Asset as Sold?

Here's an idea. Do you still have 2017 installed? Try opening 2017 program and see if you can get your 2017 return to show up in it. Go to FILE - OPEN. And see if your schedule C is in it and if it's marked as final.

Then save it again with a name and place you can find. Go to File - Save As. Then start a new 2018 return and transfer from the saved 2017 file.