GenericError constructor Null safety

1. baguette
2. GenericError
3. GenericError
4. GenericError constructor

GenericError class

1. Constructors
2. GenericError
3. Properties
4. code
5. hashCode
6. message
7. runtimeType
8. stackTrace
9. Methods
10. noSuchMethod
11. toString
12. Operators
13. operator ==