diff --git a/build/api/module/casController.php b/build/api/module/casController.php
index b18223a..d2c6e2e 100644
--- a/build/api/module/casController.php
+++ b/build/api/module/casController.php
@@ -48,9 +48,9 @@ class casController{
 		/* (0) Initialize
 		---------------------------------------------------------*/
 		/* (1) Global DOWNLOAD data */
-		$headers = ['Content-Type' => 'text/html; charset=UTF-8' ];
+		$headers    = ['Content-Type' => 'text/html; charset=UTF-8' ];
 		$body_start = "Veuillez patienter...<br>Vous allez être redirigés<script type='text/javascript'>( typeof window.opener.cas_callback === 'function' ) && window.opener.cas_callback(";
-		$body_end = ");window.close();</script>";
+		$body_end   = ");window.close();</script>";
 
 		/* (2) Reset SESSION */
 		$_SESSION['CAS'] = [];
@@ -71,15 +71,15 @@ class casController{
 
 		/* (2) Fail if no ticket */
 		if( !isset($_GET['ticket']) || !is_string($_GET['ticket']) || strlen($_GET['ticket']) < 1 )
-			return [ 'headers' => $headers, 'body' => $body_start.'null'.$body_end ];
+			return [ 'headers' => $headers, 'body' => $body_start.'-1'.$body_end ];
 
 
 
 		/* (2) Check ticket (validate)
 		---------------------------------------------------------*/
 		/* (1) Build useful variables */
-		$service  = ($_SERVER['SERVER_NAME'] == 'ptut.com' ) ? 'http' : 'https';
-		$service .= '://'.$_SERVER['HTTP_HOST'].'/api/v/1.0/cas';
+		$service      = ($_SERVER['SERVER_NAME'] == 'ptut.com' ) ? 'http' : 'https';
+		$service     .= '://'.$_SERVER['HTTP_HOST'].'/api/v/1.0/cas';
 		$ticket       = urlencode($_GET['ticket']);
 		$validate_url = "https://sso.univ-pau.fr/cas/serviceValidate?ticket=$ticket&service=$service";
 
@@ -95,14 +95,14 @@ class casController{
 
 		/* (4) Fail if not validated */
 		if( strpos($output, 'user') === false )
-			return [ 'headers' => $headers, 'body' => $body_start.'null'.$body_end ];
+			return [ 'headers' => $headers, 'body' => $body_start.'-2'.$body_end ];
 
 		/* (5) Extract cas_login */
 		$cas_login = trim(strip_tags($output));
 
 		/* (6) Check empty */
 		if( strlen($cas_login) < 1 )
-			return [ 'headers' => $headers, 'body' => $body_start.'null'.$body_end ];
+			return [ 'headers' => $headers, 'body' => $body_start.'-2'.$body_end ];
 
 
 
@@ -116,7 +116,7 @@ class casController{
 
 		/* (2) Failure: if no department for @cas_login */
 		if( count($departments) === 0 )
-			return [ 'headers' => $headers, 'body' => $body_start.'null'.$body_end ];
+			return [ 'headers' => $headers, 'body' => $body_start.'-3'.$body_end ];
 
 		/* (3) Set departments data */
 		$_SESSION['AvailableDepartment'] = $departments;
@@ -137,7 +137,7 @@ class casController{
 
 		/* (2) If not found -> reset SESSION */
 		if( !is_array($by_login) || !isset($by_login['idProfesseur']) || !isset($by_login['admin']) )
-			return [ 'headers' => $headers, 'body' => $body_start.'null'.$body_end ];
+			return [ 'headers' => $headers, 'body' => $body_start.'-4'.$body_end ];
 
 
 
diff --git a/webpack/page/login.js b/webpack/page/login.js
index 9327d76..66cc06f 100644
--- a/webpack/page/login.js
+++ b/webpack/page/login.js
@@ -42,8 +42,31 @@ window.cas_callback = function(cas_login){
 
 			setTimeout(function(){ gstore.get.login_class = 'neutral'; }, 1500);
 
+		/* (4) If error code -> display error */
+		}else if( !isNaN(cas_login) ){
+
+			gstore.get.login_class = 'invalid';
+
+			switch(cas_login){
+				case -1:
+					gstore.get.login_error_text = 'Erreur de connexion. Veuillez réessayer.<br>(errcode: no_ticket_received)';
+					break;
+				case -2:
+					gstore.get.login_error_text = 'Erreur de connexion. Veuillez réessayer.<br>(errcode: cas_not_authed)';
+					break;
+				case -3:
+					gstore.get.login_error_text = 'Erreur de connexion. Veuillez réessayer.<br>(errcode: no_meta_department)';
+					break;
+				case -4:
+					gstore.get.login_error_text = 'Erreur de connexion. Veuillez réessayer.<br>(errcode: no_matching_professor)';
+					break;
+
+			}
+
+			setTimeout(function(){ gstore.get.login_class = 'neutral'; }, 1500);
+
 		/* (4) If login -> reload page */
-		}else{
+		}else{{
 
 			gstore.get.login_error_text = 'Vous êtes connectés. Vous allez être redirigé.';
 			gstore.get.login_class = 'valid';