Update error.html

_layouts/error.html

@@ -682,7 +682,7 @@ <h2>UH OH! You're lost</h2>
           </svg>
           <p>
             The page you are looking for does not exist. How you got here is a
-            mystery. But you can click <a href="/">here</a>
+            mystery. But you can click <a href="{{site.url}}/">here</a>
             to go back to the homepage.
           </p>
         </div>