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

Call Stack:
    0.1666     233064   1. {main}() /home/gongquiz_blog/www/index.php:0
    0.5839     234352   2. require('/home/gongquiz_blog/www/_common.php') /home/gongquiz_blog/www/index.php:2
    0.6438     268936   3. include_once('/home/gongquiz_blog/lib/common.php') /home/gongquiz_blog/www/_common.php:3
    2.3254    1141504   4. dbConn->__construct() /home/gongquiz_blog/lib/common.php:68
    5.4690    1157936   5. log_e() /home/gongquiz_blog/lib/common/dbConn.class.php:48
    5.4704    1351000   6. error_::log_e() /home/gongquiz_blog/lib/libf.php:564
    5.4706    1352704   7. error_::log() /home/gongquiz_blog/lib/common/error_.class.php:81