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

Call Stack:
    0.0030     239016   1. {main}() /home/gongquiz_blog/www/index.php:0
    0.0369     240304   2. require('/home/gongquiz_blog/www/_common.php') /home/gongquiz_blog/www/index.php:2
    1.5031     274472   3. include_once('/home/gongquiz_blog/lib/common.php') /home/gongquiz_blog/www/_common.php:3
    4.7020    1145200   4. dbConn->__construct() /home/gongquiz_blog/lib/common.php:68
    4.7062    1161616   5. log_e() /home/gongquiz_blog/lib/common/dbConn.class.php:48
    4.7249    1356168   6. error_::log_e() /home/gongquiz_blog/lib/libf.php:563
    4.7251    1357896   7. error_::log() /home/gongquiz_blog/lib/common/error_.class.php:81