Yii 配置在服务器上提示报错 No such file or [ 未指定版本 ]

include(PDO.php) [function.include]: failed to open stream: No such file or directory

怎么解决？
这三个模块
extension=php_sqlite.dll
extension=php_pdo.dll
extension=php_pdo_sqlite.dll

还有
error_reporting = E_ALL & ~E_NOTICE
都已经打开并重启了IIS