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    <h1>Problem</h1> <p>The error is probably due to how you are instantiating the <code>$form</code> object. If you just use the <code>new Zend\Form\Form</code> expression or something similar the form will not be set up with the correct service locator.</p> <pre><code>$form = new \Zend\Form\Form; $form-&gt;add(array( 'type' =&gt; 'custom', 'name' =&gt; 'foobar', )); </code></pre> <h1>Solution</h1> <p>The trick here is to use the <code>FormElementManager</code> service locator to instantiate the form.</p> <pre><code>// inside a controller action $form = $this-&gt;getServiceLocator()-&gt;get('FormElementManager')-&gt;get('Form'); $form-&gt;add(array( 'type' =&gt; 'custom', 'name' =&gt; 'foobar', )); </code></pre> <p>Better yet, define a <code>form()</code> method in your controller as a shortcut to do this for you:</p> <pre><code>class MyController extends AbstractActionController { public function form($name, $options = array()) { $forms = $this-&gt;getServiceLocator()-&gt;get('FormElementManager'); return $forms-&gt;get($name, $options); } public function createAction() { $form = $this-&gt;form('SomeForm'); // ... } } </code></pre> <h1>Explanation</h1> <p>Each form object is attached to a form factory which is in turn attached to a service locator. This service locator is in charge of fetching all the classes used to instantiate new form/element/fieldset objects.</p> <p>If you instantiate a new form object (all by itself), a blank service locator is instantiated and used to fetch later classes within that form. But each subsequent object is then attached to that same service locator.</p> <p>The problem here is that <code>getFormElementConfig</code> configures a very specific instance of this service locator. This is the <code>FormElementManager</code> service locator. Once it's configured, all forms pulled from this service locator will then be attached to this service locator and will be used to fetch other elements/fieldsets etc.</p> <p>Hope this solves your issue.</p>
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    1. COThank you! First problem was that in invokables section was "custom" instead of "customElement". The second problem is how you said: did not set correct service locator. I create form in view using form factory. So, I call $factory->setFormElementManager($sm->get('FormElementManager')); in view
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