'ExamSlot' does not contain a definition for 'TimeSlot' and no accessible extension method 'TimeSlot' accepting a first argument of type 'ExamSlot' could be found (are you missing a using directive or an assembly reference?)

'Tutor' does not contain a definition for 'Skill' and no accessible extension method 'Skill' accepting a first argument of type 'Tutor' could be found (are you missing a using directive or an assembly reference?)

'Tutor' does not contain a definition for 'Skill' and no accessible extension method 'Skill' accepting a first argument of type 'Tutor' could be found (are you missing a using directive or an assembly reference?)

'Tutor' does not contain a definition for 'Skill' and no accessible extension method 'Skill' accepting a first argument of type 'Tutor' could be found (are you missing a using directive or an assembly reference?)

Operator '==' cannot be applied to operands of type 'Level' and 'LanguageLevel'

There is no argument given that corresponds to the required parameter 'time' of 'TimeSlot.TimeSlot(int, double, DateTime)'

Argument 3: cannot convert from 'LangLang.Domain.Enums.Level?' to 'LangLang.Domain.Models.LanguageLevel?'

Argument 3: cannot convert from 'LangLang.Domain.Enums.Level?' to 'LangLang.Domain.Models.LanguageLevel?'

'int' does not contain a definition for 'Id' and no accessible extension method 'Id' accepting a first argument of type 'int' could be found (are you missing a using directive or an assembly reference?)

'Course' does not contain a definition for 'LanguageLevelId' and no accessible extension method 'LanguageLevelId' accepting a first argument of type 'Course' could be found (are you missing a using directive or an assembly reference?)

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 LanguageLevelViewModel.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.

Possible null reference argument for parameter 'serviceProvider' in 'void Injector.SetServiceProvider(ServiceProvider serviceProvider)'.

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

The type 'T' cannot be used as type parameter 'T' in the generic type or method 'ServiceProviderServiceExtensions.GetRequiredService<T>(IServiceProvider)'. Nullability of type argument 'T' doesn't match 'notnull' constraint.