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

Call Stack:
    0.0643     237944   1. {main}() /home/gongquiz_blog/www/index.php:0
    0.2682     239232   2. require('/home/gongquiz_blog/www/_common.php') /home/gongquiz_blog/www/index.php:2
    0.2717     273400   3. include_once('/home/gongquiz_blog/lib/common.php') /home/gongquiz_blog/www/_common.php:3
    1.2133    1144160   4. dbConn->__construct() /home/gongquiz_blog/lib/common.php:68
    1.2136    1160560   5. log_e() /home/gongquiz_blog/lib/common/dbConn.class.php:48
    3.5046    1355064   6. error_::log_e() /home/gongquiz_blog/lib/libf.php:563
    4.3260    1356792   7. error_::log() /home/gongquiz_blog/lib/common/error_.class.php:81