Lumen route group doesn't work with named route
<p>When I define a route inside a group in Lumen framwork it's working well with a direct closure but not with a controller name ; I always get a not found exception.</p>

<pre><code>//Working
$app-&gt;group(['prefix' =&gt; 'admin'], function () use ($app) {
    $app-&gt;get('users', function ()    {
        //...
    });
});

//Get 'Class ExampleController does not exist'
$app-&gt;group(['prefix' =&gt; 'admin'], function () use ($app) {
    $app-&gt;get('users', ['uses' =&gt; 'ExampleController@indexAction']);
});
</code></pre>

<p>Thanks in advance.</p>