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

Call Stack:
    0.0068     238168   1. {main}() /home/gongquiz_blog/www/index.php:0
    0.0068     239456   2. require('/home/gongquiz_blog/www/_common.php') /home/gongquiz_blog/www/index.php:2
    0.0206     273624   3. include_once('/home/gongquiz_blog/lib/common.php') /home/gongquiz_blog/www/_common.php:3
    4.9236    1144456   4. dbConn->__construct() /home/gongquiz_blog/lib/common.php:68
    4.9535    1160888   5. log_e() /home/gongquiz_blog/lib/common/dbConn.class.php:48
    4.9904    1355464   6. error_::log_e() /home/gongquiz_blog/lib/libf.php:563
    4.9930    1357208   7. error_::log() /home/gongquiz_blog/lib/common/error_.class.php:81