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

Call Stack:
    0.0002     234160   1. {main}() /home/gongquiz_blog/www/index.php:0
    0.0002     235448   2. require('/home/gongquiz_blog/www/_common.php') /home/gongquiz_blog/www/index.php:2
    0.0005     270032   3. include_once('/home/gongquiz_blog/lib/common.php') /home/gongquiz_blog/www/_common.php:3
    7.3241    1142752   4. dbConn->__construct() /home/gongquiz_blog/lib/common.php:68
    7.3248    1159176   5. log_e() /home/gongquiz_blog/lib/common/dbConn.class.php:48
    7.3262    1352320   6. error_::log_e() /home/gongquiz_blog/lib/libf.php:564
    7.3263    1354032   7. error_::log() /home/gongquiz_blog/lib/common/error_.class.php:81