Error A PHP Error was encountered Severity: Notice Message: Only variable references should be returned by reference Filename: core/Common.php Line Number: 257

Error

A PHP Error was encountered
Severity: Notice
Message: Only variable references should be returned by reference
Filename: core/Common.php
Line Number: 257

saya install CodeIgniter versi CodeIgniter_2.1.4

ketika di install maka ada error sbg berikut 

Untuk Solving problemnya adalah

1. C:\xampp\htdocs\CodeIgniter\system\core 
Edit filename: core/Common.php, line number: 257

2. 

Before
return $_config[0] =& $config; After
$_config[0] =& $config; return $_config[0];