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

Call Stack:
    0.1950     238632   1. {main}() /home/gongquiz_blog/www/index.php:0
    0.1951     239920   2. require('/home/gongquiz_blog/www/_common.php') /home/gongquiz_blog/www/index.php:2
    0.4898     274088   3. include_once('/home/gongquiz_blog/lib/common.php') /home/gongquiz_blog/www/_common.php:3
    1.0846    1144840   4. dbConn->__construct() /home/gongquiz_blog/lib/common.php:68
    1.1120    1161240   5. log_e() /home/gongquiz_blog/lib/common/dbConn.class.php:48
    1.8139    1355752   6. error_::log_e() /home/gongquiz_blog/lib/libf.php:563
    1.8141    1357480   7. error_::log() /home/gongquiz_blog/lib/common/error_.class.php:81