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

Call Stack:
    0.0001     237176   1. {main}() /home/gongquiz_blog/www/index.php:0
    3.1665     238464   2. require('/home/gongquiz_blog/www/_common.php') /home/gongquiz_blog/www/index.php:2
    3.1667     272632   3. include_once('/home/gongquiz_blog/lib/common.php') /home/gongquiz_blog/www/_common.php:3
    3.1739    1143400   4. dbConn->__construct() /home/gongquiz_blog/lib/common.php:68
    3.1740    1159816   5. log_e() /home/gongquiz_blog/lib/common/dbConn.class.php:48
    3.1754    1354296   6. error_::log_e() /home/gongquiz_blog/lib/libf.php:563
    3.1755    1356016   7. error_::log() /home/gongquiz_blog/lib/common/error_.class.php:81