I encountered same error with T1198 form online. I quadruple checked my addition and amounts on the forms and tried re-entering zeros in unused boxes. I wasted another 25 minutes (add that to last week's time wasted) trying to troubleshoot errors in Turbotax software and I have already submitted payment. I am very frustrated with the errors and delays this year. I have used Turbotax for over a decade and used to recommend to colleagues and family. I will likely look for an alternative next year.
