This can happen when you have a 1099 to add to your forms. While the features of Turbo Tax make the process very simple, it can also surprise people this way.
The only way you can fix this is by starting over. You may be able to get all the forms you need with the Deluxe version. It depends on your specific tax situation.
You may want to look at the forms on this product description, the links are just under the white box.