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

Call Stack:
    0.0001     234024   1. {main}() /home/gongquiz_blog/www/index.php:0
    0.0001     235312   2. require('/home/gongquiz_blog/www/_common.php') /home/gongquiz_blog/www/index.php:2
    0.0004     269896   3. include_once('/home/gongquiz_blog/lib/common.php') /home/gongquiz_blog/www/_common.php:3
   12.0666    1142464   4. dbConn->__construct() /home/gongquiz_blog/lib/common.php:68
   12.2083    1158872   5. log_e() /home/gongquiz_blog/lib/common/dbConn.class.php:48
   12.2426    1351936   6. error_::log_e() /home/gongquiz_blog/lib/libf.php:564
   12.2470    1353648   7. error_::log() /home/gongquiz_blog/lib/common/error_.class.php:81