Still can't find out why the flash isn't setting and rendering to the page.

app/src/Controller/User/LoginUserAction.php

@@ -27,13 +27,19 @@ class LoginUserAction extends Controller
             $user = $this->userRepository->getFromEmail($credentials['email']);
         } catch (EntityNotFoundException $e) {
             $this->logger->error("Unable to login user.");
-            $this->session->getFlash()->add('error', "Unable to login user.");
+            $this->session
+                 ->getFlash()
+                 ->add('error', "Unable to login user.");
+
             return $this->render('user/login.twig')->withStatus(400);
         }
 
         if (!$this->auth->verify($credentials['password'], $user->getPassword())) {
             $this->logger->error("Unable to verify user password.");
-            $this->session->getFlash()->add('error', "Unable to login user.");
+            $this->session
+                 ->getFlash()
+                 ->add('error', "Unable to login user.");
+
             return $this->render('user/login.twig')->withStatus(400);
         }
 

app/templates/layouts/components/flash.twig

@@ -1,9 +1,19 @@
+{% for message in flash.get('success') %}
+    <div class="flash success">
+        {{ message }}
+    </div>
+{% endfor %}
+
 {% for message in flash.get('notice') %}
     <div class="flash notice">
         {{ message }}
     </div>
 {% endfor %}
 
+{% if flash.has('error') %}
+    <div>Hello!</div>
+{% endif %}
+
 {% for message in flash.get('error') %}
     <div class="flash error">
         {{ message }}