PHP Notice: Only variable references should be returned by reference (core/Common.php, line 256)

Traceback:
system/core/Exceptions.php, Line 182, include
system/core/Common.php, Line 516, show_php_error
system/core/Common.php, Line 256, _error_handler
system/core/Common.php, Line 276, get_config
system/core/Common.php, Line 156, config_item
system/core/CodeIgniter.php, Line 110, load_class
index.php, Line 215, require_once
Хостинг игровых серверов - HummerHost