Dereference of a possibly null reference.

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

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

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

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

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

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

Non-nullable property 'CogsLocation' 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 XmlSchemaPublisher.ValidationCallback(object sender, ValidationEventArgs args)' doesn't match the target delegate 'ValidationEventHandler' (possibly because of nullability attributes).