I had the same issue and here is the sequence I followed to clear that error.
1 - Display SCH - L, clear form and then close unused form
2-- Display T2125, clear form and then close unused form
3-- Display TP80, clear form and then close unused form
4-- Save the return
5-- Close TurboTax
6-- Open TurboTax
7-- Load the return and Netfile it to Quebec
