A PHP Error was encountered
Severity: Notice
Message: Only variable references should be returned by reference
Filename: core/Common.php
Line Number: 257
解决方法：
找到system/core目录下的Common.php文件的257行把
return $_config[0] =& $config;
改为
$_config[0] =& $config;return $_config[0];
原文：http://www.cnblogs.com/Yimi/p/5999712.html