addError method
- Object error,
 - [StackTrace? stackTrace]
 
Adds an error to the sink.
Must not be called on a closed sink.
Implementation
void addError(Object error, [StackTrace? stackTrace]);
    © 2012 the Dart project authors
Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
    https://api.dart.dev/stable/2.13.0/dart-async/EventSink/addError.html