增加extensions后出现fatal error

Fatal error: Class 'CException' not found in /yii-1.1.13.e9e4a0/framework/YiiBase.php on line 316

Fatal error: Class 'CListIterator' not found in /yii-1.1.13.e9e4a0/framework/collections/CList.php on line 90

http://www.yiiframework.com/forum/index.php/topic/23039-fatal-error-class-cexception-not-found-in-yiibasephp/

public static $phpExcelPathAlias = 'ext.phpexcel.Classes.PHPExcel';

修改为: 

public static $phpExcelPathAlias = 'ext.PHPExcel.Classes.PHPExcel';

注：linux系统区分大小写。