The type or namespace name 'LanguageLevel' could not be found (are you missing a using directive or an assembly reference?)

The type or namespace name 'LanguageLevel' could not be found (are you missing a using directive or an assembly reference?)

The type or namespace name 'LanguageLevel' could not be found (are you missing a using directive or an assembly reference?)

The type or namespace name 'LanguageLevel' could not be found (are you missing a using directive or an assembly reference?)

The type or namespace name 'LanguageLevel' could not be found (are you missing a using directive or an assembly reference?)

The type or namespace name 'LanguageLevel' could not be found (are you missing a using directive or an assembly reference?)

The type or namespace name 'LanguageLevel' could not be found (are you missing a using directive or an assembly reference?)

The type or namespace name 'LanguageLevel' could not be found (are you missing a using directive or an assembly reference?)

Process completed with exit code 1.

Node.js 16 actions are deprecated. Please update the following actions to use Node.js 20: actions/checkout@v3, actions/setup-dotnet@v3. For more information see: https://github.blog/changelog/2023-09-22-github-actions-transitioning-from-node-16-to-node-20/.

Nullability of reference types in return type of 'ExamSlot? ExamSlotRepository.Get(int id)' doesn't match implicitly implemented member 'ExamSlot IExamSlotRepository.Get(int id)' (possibly because of nullability attributes).

Nullability of reference types in return type of 'PenaltyPoint? PenaltyPointRepository.Get(int id)' doesn't match implicitly implemented member 'PenaltyPoint IPenaltyPointRepository.Get(int id)' (possibly because of nullability attributes).

Nullability of reference types in type of 'event PropertyChangedEventHandler CourseViewModel.PropertyChanged' doesn't match implicitly implemented member 'event PropertyChangedEventHandler? INotifyPropertyChanged.PropertyChanged'.

Nullability of reference types in type of 'event PropertyChangedEventHandler TutorViewModel.PropertyChanged' doesn't match implicitly implemented member 'event PropertyChangedEventHandler? INotifyPropertyChanged.PropertyChanged'.

'InputPopupWindow.TextInput' hides inherited member 'UIElement.TextInput'. Use the new keyword if hiding was intended.

'TimeSlot.ToString()' hides inherited member 'object.ToString()'. To make the current member override that implementation, add the override keyword. Otherwise add the new keyword.

Nullability of reference types in return type of 'ExamSlot? ExamSlotRepository.Get(int id)' doesn't match implicitly implemented member 'ExamSlot IExamSlotRepository.Get(int id)' (possibly because of nullability attributes).

Nullability of reference types in return type of 'PenaltyPoint? PenaltyPointRepository.Get(int id)' doesn't match implicitly implemented member 'PenaltyPoint IPenaltyPointRepository.Get(int id)' (possibly because of nullability attributes).

Nullability of reference types in type of 'event PropertyChangedEventHandler CourseViewModel.PropertyChanged' doesn't match implicitly implemented member 'event PropertyChangedEventHandler? INotifyPropertyChanged.PropertyChanged'.