diff --git a/application/controllers/Backend_api.php b/application/controllers/Backend_api.php
index 8619881b..9356a55b 100755
--- a/application/controllers/Backend_api.php
+++ b/application/controllers/Backend_api.php
@@ -562,7 +562,7 @@ class Backend_api extends EA_Controller {
                 $limit = 1000;
             }
 
-            $customers = $this->customers_model->get_batch($where, $order_by, $limit);
+            $customers = $this->customers_model->get_batch($where, $limit, null, $order_by);
 
             foreach ($customers as &$customer)
             {
diff --git a/application/models/Services_model.php b/application/models/Services_model.php
index eceb05fe..c56ccbd7 100644
--- a/application/models/Services_model.php
+++ b/application/models/Services_model.php
@@ -484,13 +484,13 @@ class Services_model extends EA_Model {
      * Get all service category records from database.
      *
      * @param mixed $where
-     * @param mixed $order_by
      * @param int|null $limit
      * @param int|null $offset
+     * @param mixed $order_by
      *
      * @return array Returns an array that contains all the service category records.
      */
-    public function get_all_categories($where = NULL, $order_by = NULL, $limit = NULL, $offset = NULL)
+    public function get_all_categories($where = NULL, $limit = NULL, $offset = NULL, $order_by = NULL)
     {
         if ($where !== NULL)
         {