addError abstract method

void addError(Object error, [ StackTrace stackTrace ])

Adds error to the controller's stream.

As StreamController.addError, but must not be called while an event is being added by add, addError or close.

Source

void addError(Object error, [StackTrace stackTrace]);

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https://api.dartlang.org/stable/1.24.3/dart-async/SynchronousStreamController/addError.html