Allow a user to change input (countcontroller) for each activity out of the listed activities (listview)

I am a newbie of flutterflow. I want to build a simple exercise App. A user can select exercises out of 5 exercises (reference list) and enter minutes (duration).

1. Reference page (1st page): a user selects exercises to work out

   

2. For duration input page (2nd page), I created dynamic child to pull out the record of exercises that the user selected at the reference page. Under listview, I see the list of exercises at test mode. Successful.

3. I then want users to enter the duration of each exercise. When I added CountController to the row widget inside ListView,

   

   I got an error: "CounterController widget with current configuration will not function properly when generated dynamically at the moment because it is associated with a local state variable. Consider wrapping it inside of a component and then generate the component dynamically." How to allow users to enter workout duration for each exercise?

   I really appreciate your help in advance.😀