In my case line 68140, or 68150 were empty but I was still able to netfile my return.In my wife's case the whole T936 was missing and that's how I got the error...
I found what the problem is (at least for me). On the 7th of April I netfiled my taxes just fine. When I attempted to do the same for my wife I got the "famous"...
I just called TT support and was not provided a date for the fix. I was told I am included in the notification list for when (if) the fix is provided, but will ...