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<a href="http://github.com/angular/angular.js/edit/master/docs/content/error/compile/ctreq.ngdoc" class="improve-docs btn btn-primary"><i class="icon-edit"> </i> Improve this doc</a><h1><code ng:non-bindable="">Missing Required Controller</code>
<div><span class="hint">error in component <code ng:non-bindable="">$compile</code>
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<div><pre class="minerr-errmsg" error-display="Controller '{0}', required by directive '{1}', can't be found!">Controller '{0}', required by directive '{1}', can't be found!</pre>
<h2 id="description">Description</h2>
<div class="description"><div class="-compile-page -compile-ctreq-page"><p>This error occurs when <a href="api/ng.$compile"><code>HTML compiler</code></a> tries to process a directive that specifies the <a href="api/ng.$compile#description_comprehensive-directive-api_directive-definition-object"><code><code>require</code> option</code></a> in a <a href="api/ng.$compile#description_comprehensive-directive-api"><code>directive definition</code></a>,
but the required directive controller is not present on the current DOM element (or its ancestor element, if <code>^</code> was specified).</p>
<p>To resolve this error ensure that there is no typo in the required controller name and that the required directive controller is present on the current element.</p>
<p>If the required controller is expected to be on a ancestor element, make ensure that you prefix the controller name in the <code>require</code> definition with <code>^</code>.</p>
<p>If the required controller is optionally requested, use <code>?</code> or <code>^?</code> to specify that.</p>
<p>Example of a directive that requires <a href="api/ng.directive:ngModel"><code>ngModel</code></a> controller:</p>
<pre><code>myApp.directive(&#39;myDirective&#39;, function() {
  return {
    require: &#39;ngModel&#39;,
    ...
  }
}</code></pre>
<p>This directive can then be used as:</p>
<pre><code>&lt;input ng-model=&quot;some.path&quot; my-directive&gt;</code></pre>
<p>Example of a directive that optionally requires a <a href="api/ng.directive:form"><code>form</code></a> controller from an ancestor:</p>
<pre><code>myApp.directive(&#39;myDirective&#39;, function() {
  return {
    require: &#39;^?form&#39;,
    ...
  }
}</code></pre>
<p>This directive can then be used as:</p>
<pre><code>&lt;form name=&quot;myForm&quot;&gt;
  &lt;div&gt;
    &lt;span my-directive&gt;&lt;/span&gt;
  &lt;/div&gt;
&lt;/form&gt;</code></pre>
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