I'm being asked to input a value on line 21 but I don't think this applies to me...why doe the check keep asking me to input a value?

[cgarcia · Accepted solution]

Use line 21 to report any taxable income not reported elsewhere on your return or other schedules. List the type and amount of income. If necessary, include a statement showing the required information.

If you have no other income, enter 0.