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

Call Stack:
    0.0034     233016   1. {main}() /home/gongquiz_blog/www/index.php:0
    0.0085     234304   2. require('/home/gongquiz_blog/www/_common.php') /home/gongquiz_blog/www/index.php:2
    0.0132     268888   3. include_once('/home/gongquiz_blog/lib/common.php') /home/gongquiz_blog/www/_common.php:3
    3.1231    1141584   4. dbConn->__construct() /home/gongquiz_blog/lib/common.php:68
    3.1232    1157992   5. log_e() /home/gongquiz_blog/lib/common/dbConn.class.php:48
    3.1390    1351072   6. error_::log_e() /home/gongquiz_blog/lib/libf.php:564
    3.1391    1352800   7. error_::log() /home/gongquiz_blog/lib/common/error_.class.php:81