It won't let me file electronically because it says I need to complete Debt Cancellation form. I have not cancelled debt. it there somewhere else in the forms that refer back to the Debt Cancellation form?
Did you enter a 1099-C in your return? If so, that's a debt cancellation.
If not, scroll down the income topics page all the way down to Miscellaneous Income, 1099-A, 1099-C. Click Update on 'Cancellation of Debt' and see if there's an entry there.