I have this same error, and twice have spent hours on the phone with TurboTax help to no solution. I have manually calculated the necessary forms and worksheets and the data in TurboTax is all correct, but it just loops on saying there is an error. There is clearly a coding glitch in the TurboTax system. Unfortunately, it's preventing me from e-filing my state return, and though I've been a long-time customer, I will not be back if there's not some resolution immediately.
