Nullability of reference types in type of parameter 'propertyName' of 'IEnumerable ValidatableBase.GetErrors(string propertyName)' doesn't match implicitly implemented member 'IEnumerable INotifyDataErrorInfo.GetErrors(string? propertyName)' (possibly because of nullability attributes).

Nullability of reference types in type of 'event EventHandler<DataErrorsChangedEventArgs> ValidatableBase.ErrorsChanged' doesn't match implicitly implemented member 'event EventHandler<DataErrorsChangedEventArgs>? INotifyDataErrorInfo.ErrorsChanged'.

Non-nullable property 'Error' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the property as nullable.

Non-nullable property 'TxId' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the property as nullable.

Non-nullable field 'errors' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the field as nullable.

Non-nullable field 'status' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the field as nullable.

Non-nullable field 'name' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the field as nullable.

Non-nullable field 'address' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the field as nullable.

Non-nullable property 'TransactionList' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the property as nullable.

Possible null reference return.

Nullability of reference types in type of parameter 'propertyName' of 'IEnumerable ValidatableBase.GetErrors(string propertyName)' doesn't match implicitly implemented member 'IEnumerable INotifyDataErrorInfo.GetErrors(string? propertyName)' (possibly because of nullability attributes).

Nullability of reference types in type of 'event EventHandler<DataErrorsChangedEventArgs> ValidatableBase.ErrorsChanged' doesn't match implicitly implemented member 'event EventHandler<DataErrorsChangedEventArgs>? INotifyDataErrorInfo.ErrorsChanged'.

Non-nullable field 'errors' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the field as nullable.

Non-nullable field 'status' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the field as nullable.

Non-nullable property 'Error' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the property as nullable.

Non-nullable property 'TxId' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the property as nullable.

Possible null reference return.

Non-nullable field 'name' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the field as nullable.

Non-nullable field 'address' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the field as nullable.

Non-nullable property 'TransactionList' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the property as nullable.

Nullability of reference types in type of parameter 'propertyName' of 'IEnumerable ValidatableBase.GetErrors(string propertyName)' doesn't match implicitly implemented member 'IEnumerable INotifyDataErrorInfo.GetErrors(string? propertyName)' (possibly because of nullability attributes).

Nullability of reference types in type of 'event EventHandler<DataErrorsChangedEventArgs> ValidatableBase.ErrorsChanged' doesn't match implicitly implemented member 'event EventHandler<DataErrorsChangedEventArgs>? INotifyDataErrorInfo.ErrorsChanged'.

Non-nullable property 'TxId' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the property as nullable.

Non-nullable property 'AddressList' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the property as nullable.

Non-nullable field 'importText' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the field as nullable.

Non-nullable event 'ClosingRequest' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the event as nullable.

Non-nullable property 'Error' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the property as nullable.

Nullability of reference types in type of parameter 'sender' of 'void MainWindowViewModel.AddressList_ListChanged(object sender, ListChangedEventArgs e)' doesn't match the target delegate 'ListChangedEventHandler' (possibly because of nullability attributes).

Dereference of a possibly null reference.