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<a href="http://github.com/angular/angular.js/edit/master/docs/content/error/injector/unpr.ngdoc" class="improve-docs btn btn-primary"><i class="icon-edit"> </i> Improve this doc</a><h1><code ng:non-bindable="">Unknown Provider</code> <div><span class="hint">error in component <code ng:non-bindable="">$injector</code> </span> </div> </h1> <div><pre class="minerr-errmsg" error-display="Unknown provider: {0}">Unknown provider: {0}</pre> <h2 id="description">Description</h2> <div class="description"><div class="-injector-page -injector-unpr-page"><p>This error results from the <code>$injector</code> being unable to resolve a required dependency. To fix this, make sure the dependency is defined and spelled correctly. For example:</p> <pre><code>angular.module(&#39;myApp&#39;, []) .controller(&#39;myCtrl&#39;, [&#39;myService&#39;, function (myService) { // Do something with myService }]);</code></pre> <p>This code will fail with <code>$injector:unpr</code> if <code>myService</code> is not defined. Making sure each dependency is defined will fix the problem.</p> <pre><code>angular.module(&#39;myApp&#39;, []) .service(&#39;myService&#39;, function () { /* ... */ }) .controller(&#39;myCtrl&#39;, [&#39;myService&#39;, function (myService) { // Do something with myService }]);</code></pre> </div></div> </div>