fix authentication error message

Resources/views/Login/login.html.twig

@@ -41,6 +41,7 @@
                 background-color: #333;
                 color: white;
                 text-align: center;
+                font-family: 'Open Sans';
             }
 
             #content {
@@ -69,7 +70,6 @@
                 width : 15em;
                 text-align: right;
                 display: inline-block;
-                font-family: 'Open Sans';
                 font-weight: 300;
                 padding-right: 5px;
             }
@@ -97,7 +97,9 @@
         <div id="content">
             <img class="logo" src="/bundles/chillmain/img/logo-chill-outil-accompagnement_white.png">
 
-            <p>{{ error|trans }}</p>
+            {% if error is not null %}
+                <p>{{ error.message|trans }}</p>
+            {% endif %}
 
             <form method="POST" action="{{ path('login_check') }}">
                 <label for="_username">{{ 'Username'|trans }}</label>