diff --git a/app/Controller/HelloWorldController.php b/app/Controller/HelloWorldController.php
index aac2684..eed77a5 100644
--- a/app/Controller/HelloWorldController.php
+++ b/app/Controller/HelloWorldController.php
@@ -15,7 +15,7 @@ class HelloWorldController
     #[Route('/')]
     public function index(): ViewInterface
     {
-        return new BaseView('/index.php');
+        return new BaseView('/index');
     }
 
     #[Route('/error')]
@@ -33,7 +33,7 @@ class HelloWorldController
     #[Route('/view/{name}')]
     public function view(string $name): ViewInterface
     {
-        return new BaseView('/home.php', ['name' => $name]);
+        return new BaseView('/home', ['name' => $name]);
     }
 
     #[Route('/routes/{word}')]
diff --git a/app/Template/index.php b/app/Template/index.php
index 9d633a4..9d8a892 100644
--- a/app/Template/index.php
+++ b/app/Template/index.php
@@ -1,4 +1,4 @@
 <?php /** @var $this \Ardent\Undercurrent\View\BaseView */ ?>
-<?php $this->extends = '/base.php' ?>
+<?php $this->extends = '/base' ?>
 
-Hello <a href="<?= $this->helper->getRoute(\App\Controller\HelloWorldController::class, 'hello') ?>">index</a>!
+Hello <a href="<?= $this->getRoute(\App\Controller\HelloWorldController::class, 'hello') ?>">index</a>!
diff --git a/src/Container/GenericContainer.php b/src/Container/GenericContainer.php
index 0e467b6..96b0b94 100644
--- a/src/Container/GenericContainer.php
+++ b/src/Container/GenericContainer.php
@@ -3,6 +3,8 @@
 namespace Ardent\Undercurrent\Container;
 
 use Ardent\Undercurrent\Http\RouteConfig;
+use Ardent\Undercurrent\Logger\LogContainer;
+use Ardent\Undercurrent\Logger\LoggerInterface;
 use Exception;
 use ReflectionClass;
 use ReflectionMethod;
@@ -15,12 +17,20 @@ class GenericContainer implements ContainerInterface
 
     private array $aliases = [];
 
-    public function add(string $className, ?callable $definition = null, bool $singleton = true): self
+    public function add(
+        string    $className,
+        ?callable $definition = null,
+        bool      $singleton = true
+    ): self
     {
         if (!$definition) {
             $definition = fn() => $this->autowire($className);
         }
 
+        if (isset($this->definitions[$className])) {
+            throw new Exception(sprintf('Class %s already defined', $className));
+        }
+
         $this->definitions[$className] = [
             'definition' => $definition,
             'singleton' => $singleton,
@@ -55,6 +65,10 @@ class GenericContainer implements ContainerInterface
                 return $this->instances[$className];
             }
             $instance = $definition($this);
+            if ($className !== LogContainer::class) {
+                $logger = $this->get(LoggerInterface::class);
+                $logger->add(sprintf('Created singleton instance of %s', $className));
+            }
             $this->instances[$className] = $instance;
         } else {
             $instance = $definition($this);
diff --git a/src/Kernel/BaseKernel.php b/src/Kernel/BaseKernel.php
index 64f83cc..d983400 100644
--- a/src/Kernel/BaseKernel.php
+++ b/src/Kernel/BaseKernel.php
@@ -72,9 +72,11 @@ class BaseKernel
 
         echo $response->getBody();
 
+        echo '<pre>';
         foreach ($log->getLogs() as $log) {
-            echo sprintf('<p>%s</p>', $log);
+            echo sprintf('%s<br>', $log);
         }
+        echo '</pre>';
     }
 
     protected function addControllers(ContainerInterface $container, array $controllers): void
diff --git a/src/View/BaseView.php b/src/View/BaseView.php
index 1c9820b..5050e86 100644
--- a/src/View/BaseView.php
+++ b/src/View/BaseView.php
@@ -20,14 +20,26 @@ class BaseView implements ViewInterface
     {
         $this->helper = $helper;
         $path = $config->getTemplatePath() . $this->path;
+        if (!str_ends_with($path, '.php')) {
+            $path .= '.php';
+        }
+
+        if (!file_exists($path)) {
+            throw new \RuntimeException(sprintf('View file %s does not exist', $path));
+        }
 
         ob_start();
         include $path;
         $output = ob_get_clean();
         if ($this->extends) {
-            return (new BaseView($this->extends, $this->data + ['slot' => $output]))->render($config, $helper);
+            return (new BaseView($this->extends, $this->data + ['slot' => $output]))->render(...func_get_args());
         }
 
         return $output;
     }
+
+    public function getRoute(string $class, string $method, array $params = []): string
+    {
+        return $this->helper->getRouter()->toUri($class, $method, $params);
+    }
 }
\ No newline at end of file
diff --git a/src/View/ViewHelper.php b/src/View/ViewHelper.php
index f73f510..02436fd 100644
--- a/src/View/ViewHelper.php
+++ b/src/View/ViewHelper.php
@@ -12,8 +12,8 @@ class ViewHelper
     {
     }
 
-    public function getRoute(string $class, string $method, array $params = []): string
+    public function getRouter(): RouterInterface
     {
-        return $this->router->toUri($class, $method, $params);
+        return $this->router;
     }
 }
\ No newline at end of file