This error normally appears when there are forms in your return that are not ready for e-filing. You might try restarting the review and then filing steps and take note of any messages about forms not ready.
You could also continue the filing process and try just e-filing the Federal returns, if it is your state you are working on now. You of course would then need to check back later to complete e-filing the returns or print and mail them if you wish.
If you're using TurboTax Online, try closing the program, clear your Cache and Cookies, and return to Efile.