Let me tell more about my case, then you may see more about this error code.
I first used Futuretax to file my return ( I used it for many years), got that code, then I tried TurboTax, thought it may be a bug of that software. Unfortunately my Netfile account was locked. After I called CRA to unlock my account which as I said took me 2.5 hours. then I used TurboTax to file my return. It successed. Then I try to file my wife's return with TurboTax right after, again got the same code.
Now I am waiting for the fix either from TurboTax or FutureTax, or from CRA. I do not want my wife's Netfile account blocked too.
