I had the same problem as well. The age is between 65 to 70, but ufile notify me that I am not qualify to make such election!!!!
Spend one day to try to find solution but failed.
Next year it maybe better to try other software.
I have the same problem. I choose not to contribute cpp for the self-employment income but ufile can not take the message and generate the schedule 8 properly.
Really hope they can fix this bug as fast as they could.