diff --git a/source/developers/cla_sign.html b/source/developers/cla_sign.html
index 6c7571430b9..4a43f097155 100644
--- a/source/developers/cla_sign.html
+++ b/source/developers/cla_sign.html
@@ -29,12 +29,20 @@ description: "The Home Assistant contributor license agreement (CLA) signature p
   #complete {
     display: none;
   }
+
+  #error {
+    background: red;
+    color: white;
+    padding: 4px;
+    display: none;
+  }
 </style>
 
 <div id="loading">
   <div id="spinner"></div>
   <p>Please wait while we complete authentication and load data from GitHub...</p>
 </div>
+<div id="error"></div>
 
 <form action="#" id="signature_form">
   <div class="wrapper">
@@ -454,6 +462,7 @@ description: "The Home Assistant contributor license agreement (CLA) signature p
       }
     });
     $('#submit').click(function(e){
+      const errorEl = document.querySelector("#error")
       if ($('form')[0].checkValidity()) {
         e.preventDefault();
         var payload = {
@@ -489,6 +498,10 @@ description: "The Home Assistant contributor license agreement (CLA) signature p
           }
           localStorage.removeItem("pr");
           localStorage.removeItem("gh_token");
+          errorEl.style.display = "none"
+        }).fail(function(data){
+          errorEl.textContent = data.responseJSON.message;
+          errorEl.style.display = "block"
         });
       }
     });