The program is probably asking you to review an expense (or income) item that you had in the past, but do not have now.
If this happens and the program will not let you proceed without an entry, enter $1.
An additional $1 of expense (or income) will not affect your tax calculation, but will allow you to proceed.
(If you are concerned about accuracy, you can add a $1 to an offsetting category to make the workaround "neutral" for income.)
