Not sure what error you’re getting, but I’m seeing that property in there.
class ActionColumn extends Column
{
/**
* @var string the ID of the controller that should handle the actions specified here.
* If not set, it will use the currently active controller. This property is mainly used by
* [[urlCreator]] to create URLs for different actions. The value of this property will be prefixed
* to each action name to form the route of the action.
*/
public $controller;