diff --git a/src/ControllerTrait.php b/src/ControllerTrait.php
index d47f216..9bb5e59 100644
--- a/src/ControllerTrait.php
+++ b/src/ControllerTrait.php
@@ -61,6 +61,13 @@ trait ControllerTrait {
         );
     }
 
+    public function renderError(string $errorCode, ?array $variables = null) : ResponseInterface
+    {
+        return static::renderHtml(
+            $this->renderRawView("$lean/error/{$code}", $variables ?? [])
+        );
+    }
+
     public function renderDocumentation(string $filename) : ResponseInterface
     {
         return $this->renderMarkdown( file_get_contents(getenv("PROJECT_PATH") . "/meta/doc/$filename.md") );