Fix bug on create user

user-binding.php

@@ -72,6 +72,7 @@ echo $OUTPUT->header();
 echo $OUTPUT->footer();
 
 function createUser($user, $isTeacher) {
+    $fetchInstitution = new fetch\institution();
     $success = $fetchInstitution->createUser([
         'first_name' => $user->firstname,
         'user_name' => $user->lastname,