Is the software giving you specifics on what needs to be reviewed on your Schedule C?
If you are claiming/reporting any business assets in the Business Assets section, work through each individual asset one at a time and check the figures. More than likely you won't need to change a single thing. But work through each asset one at a time anyway, all the way to the end of that section and click the "Done with Assets" button once you've done that. Then run the final checks again and see if that does the trick. (It usually does.)
That didn't work for me, TurboTax appears to have a rule that flags no changes to Assets from the previous year as invalid/needs review - I consider this a software defect. I was able to get unblocked by adding a $1 Asset.
If I ignore this and file the return anyway, will it cause a problem?
Before you do that I would take a look at the actual schedule C (you can print a pdf after you have paid but before you send in the return). Make sure that the numbers that are being sent to the IRS are exactly what you want them to be. If you see any discrepancies then you'll know which number to fix. If everything looks correct then you can go ahead and send it.