I am getting the same error message, but I disagree with the fact that once children reach the age of 13 they are no longer eligible. The error message states:
"You have claimed childcare expenses for an ineligible dependant. For your dependant to be eligible for childcare expenses, they must be 16 or under on December 31, 2020"
The same information is available on the CRA website:
https://www.canada.ca/en/revenue-agency/services/tax/individuals/topics/about-your-tax-return/tax-re...
I believe this is a bug in the program.
