Routes Problem

Hello there, I have route problem 

`$routes[] = [
	'method' => 'get',
	'route' => '/ping', 
	'handler' => ['Controllers\ExampleController', 'pingAction']
];`

does not work but when I write 

`$routes[] = [
	'method' => 'get',
	'route' => '/ping', 
	'handler' => function()
           { echo "test"; }
];`

its work. 

thanks.