Do you have the correct province selected? If you have CPP contributions on your T4 but you choose Quebec (QC) as a province, you’ll get that error. Same thing if you have QPP contributions but choose a province that’s not Quebec.
February 20, 2020 I am getting the same error and the info has been typed in exactly as the T4 the province is correct as well as the CPP & EI amounts, will this prevent the return from being netfiled on Monday???