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<a href="http://github.com/angular/angular.js/edit/master/docs/content/error/injector/itkn.ngdoc" class="improve-docs btn btn-primary"><i class="icon-edit"> </i> Improve this doc</a><h1><code ng:non-bindable="">Bad Injection Token</code> <div><span class="hint">error in component <code ng:non-bindable="">$injector</code> </span> </div> </h1> <div><pre class="minerr-errmsg" error-display="Incorrect injection token! Expected service name as string, got {0}">Incorrect injection token! Expected service name as string, got {0}</pre> <h2 id="description">Description</h2> <div class="description"><div class="-injector-page -injector-itkn-page"><p>This error occurs when using a bad token as a dependency injection annotation. Dependency injection annotation tokens should always be strings. Using any other type will cause this error to be thrown.</p> <p>Examples of code with bad injection tokens include:</p> <pre><code>var myCtrl = function ($scope, $http) { /* ... */ }; myCtrl.$inject = [&#39;$scope&#39;, 42]; myAppModule.controller(&#39;MyCtrl&#39;, [&#39;$scope&#39;, {}, function ($scope, $timeout) { // ... }]);</code></pre> <p>The bad injection tokens are <code>42</code> in the first example and <code>{}</code> in the second. To avoid the error, always use string literals for dependency injection annotation tokens.</p> <p>For an explanation of what injection annotations are and how to use them, refer to the <a href="guide/di">Dependency Injection Guide</a>.</p> </div></div> </div>