Why do I get error message "Incomplete fields.." on T1135 from even though I have filled out all six boxes?

did you get an answer on this - I have the same and can't move on in the form

I have the same problem on TurboTax Standard (PC application).  Intuit support told me to enter 1 instead of zero (and refused to send me an email with the same "advice").
How can I use Chrome with the PC application?

I ended up using Chrome browser on my PC and loading turbo tax through that - then the missing box appeared and I could move on.  Definitely a bug in the software that seems to have no other solution than using Chrome.  Thank you to shahabmos for the answer on this forum - much appreciated

You need to use Chrome otherwise a box gets hidden and you'll get the error