SQLSTATE[08004] [1040] Too many connections

FILE: E:\wwwroot\74cms\ThinkPHP\Library\Think\Db\Driver.class.php 　LINE: 109

#0 E:\wwwroot\74cms\ThinkPHP\Library\Think\Db\Driver.class.php(109): E('SQLSTATE[08004]...')
#1 E:\wwwroot\74cms\ThinkPHP\Library\Think\Db\Driver.class.php(1092): Think\Db\Driver->connect()
#2 E:\wwwroot\74cms\ThinkPHP\Library\Think\Db\Driver\Mysql.class.php(47): Think\Db\Driver->initConnect(true)
#3 E:\wwwroot\74cms\ThinkPHP\Library\Think\Model.class.php(135): Think\Db\Driver\Mysql->getFields('qs_members')
#4 E:\wwwroot\74cms\ThinkPHP\Library\Think\Model.class.php(123): Think\Model->flush()
#5 E:\wwwroot\74cms\ThinkPHP\Library\Think\Model.class.php(1515): Think\Model->_checkTableInfo()
#6 E:\wwwroot\74cms\ThinkPHP\Library\Think\Model.class.php(97): Think\Model->db(0, '', true)
#7 E:\wwwroot\74cms\ThinkPHP\Common\functions.php(599): Think\Model->__construct('Members')
#8 E:\wwwroot\74cms\Application\Common\qscmslib\passport\default.php(12): D('Members')
#9 E:\wwwroot\74cms\Application\Common\qscmslib\passport.class.php(21): default_passport->__construct()
#10 E:\wwwroot\74cms\Application\Common\Controller\FrontendController.class.php(254): Common\qscmslib\passport->__construct(NULL)
#11 E:\wwwroot\74cms\Application\Common\Controller\FrontendController.class.php(45): Common\Controller\FrontendController->_user_server()
#12 E:\wwwroot\74cms\Application\Home\Controller\NewsController.class.php(6): Common\Controller\FrontendController->_initialize()
#13 E:\wwwroot\74cms\ThinkPHP\Library\Think\Controller.class.php(41): Home\Controller\NewsController->_initialize()
#14 E:\wwwroot\74cms\ThinkPHP\Common\functions.php(684): Think\Controller->__construct()
#15 E:\wwwroot\74cms\ThinkPHP\Library\Think\App.class.php(87): controller('News', '')
#16 E:\wwwroot\74cms\ThinkPHP\Library\Think\App.class.php(204): Think\App::exec()
#17 E:\wwwroot\74cms\ThinkPHP\Library\Think\Think.class.php(120): Think\App::run()
#18 E:\wwwroot\74cms\ThinkPHP\ThinkPHP.php(102): Think\Think::start()
#19 E:\wwwroot\74cms\index.php(51): require('E:\wwwroot\74cm...')
#20 {main}