Why won't turbo tax allow me file a federal tax return for my deceased father? He died in 2016. I filed his 2016 taxes, but just received a 2017 1099-C for $27K.

My father died in 2016. I am the executor of his estate. I filed his 2016 taxes with TurboTax, but had not planned to file 2017 taxes because his estate had no income, but I just received a 1099-C from one of his debtors for $27K. I tried to create a 2017 tax return, but TurboTax will not allow me to do so because he died in 2016. The estate does not have any money, but he does have a piece of property that we are trying to sell to pay he remaining debt. The probate is still open. What am I required to do?