Hello, had the same issue, working in Ontario, living in Quebec and impossible to file because of the subject error.
After a couple of hours going in circle and reading the posts, I realized that the 16A box amount of $188 is a maximum amount. Referring to line 26 of the Form RC381- Inter-Provincial Calculation for CPP and QPP Contributions and Overpayments it does indicates $188 as the maximum. I received a T4 for my Ontario Income with a 16A Box with $188 and a Relevé 1 for my Public Service Private Insurance (Employer insurance contribution is considered income for Quebec Tax) with a Box B-2 also of $188.00. I think it was a duplication of the same amount and TurboTax flagged it as an error with no information. Once I removed the $188 from the B-2 box of the Relevé 1, I was able to file both Provincial and Federal. But yes, it caused the return to be reduced by a whole $188. So maybe I am short $188 or maybe it was an error on that Relevé 1 - but I was able to file. Hope that helps. Cheers !
