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

Call Stack:
    0.0003     232760   1. {main}() /home/gongquiz_blog/www/index.php:0
    0.0005     234048   2. require('/home/gongquiz_blog/www/_common.php') /home/gongquiz_blog/www/index.php:2
    0.0011     268632   3. include_once('/home/gongquiz_blog/lib/common.php') /home/gongquiz_blog/www/_common.php:3
    0.1415    1141248   4. dbConn->__construct() /home/gongquiz_blog/lib/common.php:68
    0.1430    1157664   5. log_e() /home/gongquiz_blog/lib/common/dbConn.class.php:48
    0.1446    1350776   6. error_::log_e() /home/gongquiz_blog/lib/libf.php:564
    0.1448    1352480   7. error_::log() /home/gongquiz_blog/lib/common/error_.class.php:81