Slim3 telling me that callable route can't be found - slim-3

Question

I'm new to slim. I ran into an error telling me the callable controller does not exist. However my other controller (HomeController) does work. I'm sure I am doing something stupid but I can't figure out what.
Error Message
Type: RuntimeException
Message: Callable JoeyD473\RPG_Tools\controllers\traveller\UniverseCreationControllercreateUniverse does not exist
File: C:\Users\Joey\Web\JRD_Traveller_Tools\vendor\slim\slim\Slim\CallableResolver.php
Line: 90
Project Structure
\public
index.php
.htaccess
\src
\app
\controllers
BaseController.php
HomeController.php
\traveller
UniverseCreationController.php
\model
\views
config.php
container.php
routes.php
composer.json
"autoload": {
"psr-4": {
"JoeyD473\\RPG_Tools\\models\\": "src/app/model",
"JoeyD473\\RPG_Tools\\controllers\\": "src/app/controllers"
}
},
container.php
$container = $app->getContainer();
$container['view'] = new \Slim\Views\PhpRenderer(APP.'views/');
$container['db'] = function($c){
$settings = $c->get('settings')['db'];
$db = new \Aura\Sql\ExtendedPdo($settings['vendor'].':host='.$settings['host'].';dbname='.$settings['db_name'],$settings['username'],$settings['password']);
return $db;
};
$container['HomeController'] = function($container){
return new \JoeyD473\RPG_Tools\controllers\HomeController;
};
$container['UniverseCreationController'] = function($container){
return new \JoeyD473\RPG_Tools\controllers\traveller\UniverseCreationController;
};
routes.php
$app->get('/',JoeyD473\RPG_Tools\controllers\HomeController::class.':home');
$app->get('/api',JoeyD473\RPG_Tools\controllers\HomeController::class.':sw_api');
$app->get('/temp',JoeyD473\RPG_Tools\controllers\HomeController::class.':temp');
$app->get('/universe/create_new_universe',JoeyD473\RPG_Tools\controllers\traveller\UniverseCreationController::class.'createUniverse');
UniverseCreationController.php
namespace JoeyD473\RPG_Tools\controllers\traveller;
use JoeyD473\RPG_Tools\controllers\BaseController;
use JoeyD473\RPG_Tools\models\traveller\universe\Universes;
class UniverseCreationController extends BaseController
{
public function createUniverse($request,$response)
{
return $this->container->view->render($response,'travellers/universe/create_universe.phtml');
}
public function generateUniverse($request,$response)
{
$universe = new Universes($this->db);
return 'generateSector';
}
}

Answer 1

You've missed a colon (:) in your last route
\traveller\UniverseCreationController::class.'createUniverse');
^^^
You could also use the array syntax for this.
[YourClass::class, 'yourMethod']