Non-nullable field '_user' must contain a non-null value when exiting constructor. Consider declaring the field as nullable.

Non-nullable field '_userQuiz' must contain a non-null value when exiting constructor. Consider declaring the field as nullable.

Converting null literal or possible null value to non-nullable type.

Non-nullable property 'Questions' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

Non-nullable property 'ScoringRules' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

Non-nullable property 'Questions' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

Non-nullable field '_sourceQuestions' must contain a non-null value when exiting constructor. Consider declaring the field as nullable.

Non-nullable property 'UserAnswerOption' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

Non-nullable property 'UserAnswerOptionText' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.