diff --git a/src/Base/NotFoundController.php b/src/Base/NotFoundController.php
index e3c2a17..e493379 100644
--- a/src/Base/NotFoundController.php
+++ b/src/Base/NotFoundController.php
@@ -16,9 +16,9 @@ class NotFoundController extends Controller
     public function fail(): ResponseInterface
     {
         if ($this->request->getMethod() == 'OPTIONS') {
-            return $this->response->withStatus(200, "");
+            return \response()->withStatus(200, "");
         }
-        return $this->response->withStatus(404, "not found page.");
+        return \response()->withStatus(404, "not found page.");
     }
 
 }
diff --git a/src/ControllerInterpreter.php b/src/ControllerInterpreter.php
index c7a11dd..87de649 100644
--- a/src/ControllerInterpreter.php
+++ b/src/ControllerInterpreter.php
@@ -80,11 +80,6 @@ class ControllerInterpreter
             $reflectionMethod = $reflectionClass->getMethod($reflectionMethod);
         }
 
-        $returnType = $reflectionMethod->getReturnType();
-        if (method_exists($returnType, 'getName') && $returnType->getName() !== 'Psr\Http\Message\ResponseInterface') {
-            die('Request Handler<' . $class::class . '::' . $reflectionMethod->getName() . '> returns must implements on Psr\Http\Message\ResponseInterface');
-        }
-
         $container  = \Kiri::getDi();
         $parameters = $container->getMethodParams($reflectionMethod);