defined in <a href="https://github.com/angular/angular/tree/2.0.0-alpha.34/modules/angular2/src/di/exceptions.ts#L58-L71">angular2/src/di/exceptions.ts (line 58)</a>
Thrown when trying to retrieve a dependency by `Key` from <a href='Injector-class.html'><code>Injector</code></a>, but the
<a href='Injector-class.html'><code>Injector</code></a> does not have a <a href='Binding-class.html'><code>Binding</code></a> for <a href='Key-class.html'><code>Key</code></a>.
