Add the definitions for the Repository classes, need to use them in the bootstrap class.

app/src/Bootstrap.php

@@ -94,6 +94,12 @@ class Bootstrap
             },
             ResponseFactoryInterface::class => function (ContainerInterface $container) {
                 return new ResponseFactory();
+            },
+            UserRepositoryInterface::class => function (ContainerInterface $container) {
+                return new UserRepository(
+                    $container->get(DatabaseConnectionInterface::class),
+                    $container->get(UserAuthorizationInterface::class)
+                );
             }
         ]);
 

app/templates/user/register.twig

@@ -16,8 +16,8 @@
             <input name="password" type="password" required>
         </div>
         <div>
-            <label for="check_password">Confirm Password<br>
+            <label for="checked_password">Confirm Password<br>
-            <input name="check_password" type="password" required>
+            <input name="checked_password" type="password" required>
         </div>
         <div>
             <input type="submit" label="Submit">