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

Call Stack:
    0.7999     232856   1. {main}() /home/gongquiz_blog/www/index.php:0
    1.4137     234144   2. require('/home/gongquiz_blog/www/_common.php') /home/gongquiz_blog/www/index.php:2
    2.0572     268728   3. include_once('/home/gongquiz_blog/lib/common.php') /home/gongquiz_blog/www/_common.php:3
    5.7585    1141552   4. dbConn->__construct() /home/gongquiz_blog/lib/common.php:68
    5.7749    1157976   5. log_e() /home/gongquiz_blog/lib/common/dbConn.class.php:48
    5.7773    1351072   6. error_::log_e() /home/gongquiz_blog/lib/libf.php:564
    5.7775    1352784   7. error_::log() /home/gongquiz_blog/lib/common/error_.class.php:81