Fatal error: Class 'Client' not found in /home/gongquiz_blog/lib/common/error_.class.php on line 92

Call Stack:
    0.4450     232616   1. {main}() /home/gongquiz_blog/www/index.php:0
    0.4451     233904   2. require('/home/gongquiz_blog/www/_common.php') /home/gongquiz_blog/www/index.php:2
    0.4453     268488   3. include_once('/home/gongquiz_blog/lib/common.php') /home/gongquiz_blog/www/_common.php:3
    3.4215    1141112   4. dbConn->__construct() /home/gongquiz_blog/lib/common.php:68
    4.0564    1157552   5. log_e() /home/gongquiz_blog/lib/common/dbConn.class.php:48
    5.8959    1352120   6. error_::log_e() /home/gongquiz_blog/lib/libf.php:563
    5.8963    1353856   7. error_::log() /home/gongquiz_blog/lib/common/error_.class.php:81