dart-io/IOSink/addError.html">addError</a></span><span class="signature">(<wbr><span class="parameter" id="addError-param-error"><span class="type-annotation"><a href="dart-core/Object-class.html">Object</a></span> <span class="parameter-name">error</span>, [</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> ])
            <span class="returntype par