diff --git a/index.html b/index.html
index 3498712..7ba0da5 100644
--- a/index.html
+++ b/index.html
@@ -5,7 +5,7 @@
 <head>
     <title>My awesome team</title>
 
-    <link rel="stylesheet" href="/css/style.css" />
+    <link rel="stylesheet" href="./css/style.css" />
 </head>
 
 <body>
@@ -14,13 +14,13 @@
         <team-card></team-card>
     </div>
 
-    <script src="/src/misc/constant.js"></script>
+    <script src="./src/misc/constant.js"></script>
 
     <script type="module">
         import { createApp } from 'https://unpkg.com/vue@3/dist/vue.esm-browser.js';
 
-        import Navbar from '/src/view/navbar.js';
-        import TeamCard from '/src/view/team_add.js';
+        import Navbar from './src/view/navbar.js';
+        import TeamCard from './src/view/team_add.js';
       
         const app = createApp({
             data(){
diff --git a/src/error/required_field_error.js b/src/error/required_field_error.js
new file mode 100644
index 0000000..0d2f81a
--- /dev/null
+++ b/src/error/required_field_error.js
@@ -0,0 +1,5 @@
+class RequiredFieldError extends Error {
+    constructor(field) {
+        super('Le champ ${field} est obligatoire !');
+    }
+}
\ No newline at end of file
