payment formula has no errors

payment formula has no errors

I have created a loan payment calculator in the Potentials Layout and the formula field will not return any results.

Fields:
Amount
Term (in months)
Advance Payments
Int rate
Future Value
Payment (formula field) 

(${Potentials.Amount}-${Potentials.Future Value}/(1+${Potentials.Int Rate}/12)^${Potentials.Term}/((1-(1+${Potentials.Int Rate}/12)^(-${Potentials.Term}-${Potentials.Advance Payments})))/(${Potentials.Int Rate}/12)+${Potentials.Advance Payments})

This formula syntax has NO ERRORS in Zoho and works fine in Excel Spreadsheet.But will not return any results in Zoho. Any suggestions on what may be wrong? Could it be the Amount field (standard field) being used in formula?