Remove useless extra warning on invalid login

app/templates/registration/login.html

@@ -2,13 +2,6 @@
 {% block title %}Login{% endblock %}
 {% block content %}
 
-{% if form.errors %}
-<div class="alert-message fade in error" data-alert="alert">
-    <a class="close" href="#">x</a>
-    <p>Your username or password was incorrect, please try again.</p>
-</div>
-{% endif %}
-
 <div class="page-header">
   <h1>Login</h1>
 </div>