addError abstract method
void addError(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.
Source
void addError(error, [StackTrace stackTrace]);
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https://api.dartlang.org/stable/1.24.3/dart-io/IOSink/addError.html