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]);
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Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
https://api.dartlang.org/stable/2.0.0/dart-io/IOSink/addError.html