fixed RedirectResponse issue

modules/lti_tool_provider_content/src/Controller/LTIToolProviderContentLaunch.php

@@ -61,7 +61,10 @@ class LTIToolProviderContentLaunch extends ControllerBase {
     catch (Exception $e) {
       $this->getLogger('lti_tool_provider_content')->warning($e->getMessage());
       LTIToolProviderContext::sendError($e->getMessage(), $context ?? NULL);
-      return new RedirectResponse('/', 500);
+      $accessDeniedUrl = Url::fromRoute('system.403')->toString();
+      
+              return new RedirectResponse($accessDeniedUrl, 302);
+            
     }
   }