Merge pull request #16980 from cakephp/ADmad-patch-1

Fix key name

src/Controller/ControllerFactory.php

@@ -346,7 +346,7 @@ class ControllerFactory implements ControllerFactoryInterface, RequestHandlerInt
     protected function missingController(ServerRequest $request)
     {
         return new MissingControllerException([
-            'class' => $request->getParam('controller'),
+            'controller' => $request->getParam('controller'),
             'plugin' => $request->getParam('plugin'),
             'prefix' => $request->getParam('prefix'),
             '_ext' => $request->getParam('_ext'),