Passes the error to the target consumer as an error event.
This function must not be called when a stream is currently being added using addStream.
This operation is non-blocking. See flush or done for how to get any errors generated by this call.
void addError(error, [StackTrace stackTrace]) { _sink.addError(error, stackTrace); }
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https://api.dart.dev/stable/2.5.0/dart-io/Stdout/addError.html