运行《从入门到精通第2版》书第20章的 TM\sl\20\4\public 后面的都报如下ZendFroamework错误是怎么回事？
Fatal error: Uncaught exception 'Zend_Controller_Dispatcher_Exception' with message 'Invalid controller specified (error)' in C:\AppServ\www\sourceCode\chapter20\20\4\library\Zend\Controller\Dispatcher\Standard.php:241 Stack trace: #0 C:\AppServ\www\sourceCode\chapter20\20\4\library\Zend\Controller\Front.php(936): Zend_Controller_Dispatcher_Standard->dispatch(Object(Zend_Controller_Request_Http), Object(Zend_Controller_Response_Http)) #1 C:\AppServ\www\sourceCode\chapter20\20\4\library\Zend\Application\Bootstrap\Bootstrap.php(77): Zend_Controller_Front->dispatch() #2 C:\AppServ\www\sourceCode\chapter20\20\4\library\Zend\Application.php(303): Zend_Application_Bootstrap_Bootstrap->run() #3 C:\AppServ\www\sourceCode\chapter20\20\4\public\index.php(8): Zend_Application->run() #4 {main} thrown in C:\AppServ\www\sourceCode\chapter20\20\4\library\Zend\Controller\Dispatcher\Standard.php on line 241