Remove extra space...
diff --git a/system/libraries/Session/drivers/Session_native.php b/system/libraries/Session/drivers/Session_native.php
index da744f3..a837b89 100755
--- a/system/libraries/Session/drivers/Session_native.php
+++ b/system/libraries/Session/drivers/Session_native.php
@@ -1,4 +1,4 @@
-<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');
+<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
 /**
  * CodeIgniter
  *