1. m4e_sdk
2. dart:core
3. StateError
4. toString method

StateError class

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

String toString() => "Bad state: $message";