>, [</span> <span class="parameter" id="addError-param-stackTrace"><span class="type-annotation"><a href="dart-core/StackTrace-class.html">StackTrace</a></span> <span class="parameter-name">stackTrace</span></span> ])
      <div class="features">override</div>
    </section>
    <section class="desc markdown">
      <p>Adds error to the controller's stream.</p>
<p>As <a href="dart-async/SynchronousStreamController/addError.html">StreamController.addError</a>, but must not be called while an event is
being a