Changing _answersModel to answersModel would fix your issue.
Also calling AnswersController.answersModel doesn’t work because answersModel is not a static field, I think you meant call answersController.answersModel
Note:
Adding an underscore to a class file is making it private field in dart/flutter which means it can’t be accessed in another file.
solved How to fix this error calling getter in view from controller in flutter using GetX [closed]