sm v2 for error preview

Author: samsonasik

config/module.config.php

@@ -8,7 +8,12 @@
 return [
 
     'controllers' => [
+        'invokables' => [
+            // sm v2 compat
+            Controller\ErrorPreviewController::class => Controller\ErrorPreviewController::class,
+        ],
         'factories' => [
+            // sm v3
             Controller\ErrorPreviewController::class => InvokableFactory::class,
         ],
     ],