Excel Loan Payment Amortization Schedule

I have attached a loan payment schedule that will break out the interest and principle to apply to an outstanding loan balance. The only issue I have is that I tested it with a 20 year $ 39,300 note (see attached) and it did not zero out on the 240th payment. I have looked over it until I am dazed....... I know it is something simple.....

This will be a great sheet if problem is solved!!