登录无缘无故出错 [ 新手入门 ]

我前几天做的登录功能，当时一切都没有问题的。。可是最近登录却出现了下面可恶的错误，我调了好久了，不知道为什么。。请大家帮帮忙。 PHP Error

unserialize(): Error at offset 5 of 92 bytes

/www/app/yiiframework/framework/base/CStatePersister.php(96)

084             $cacheKey=\'Yii.CStatePersister.\'.$stateFile;
085             if(($value=$cache->get($cacheKey))!==false)
086                 return unserialize($value);
087             else if(($content=@file_get_contents($stateFile))!==false)
088             {
089                 $cache->set($cacheKey,$content,0,new CFileCacheDependency($stateFile));
090                 return unserialize($content);
091             }
092             else
093                 return null;
094         }
095         else if(($content=@file_get_contents($stateFile))!==false)
096             return unserialize($content);
097         else
098             return null;
099     }
100 
101     /**
102      * Saves application state in persistent storage.
103      * @param mixed $state state data (must be serializable).
104      */
105     public function save($state)
106     {
107         file_put_contents($this->stateFile,serialize($state),LOCK_EX);
108     }

Stack Trace
#0 	
+
 /www/app/yiiframework/framework/base/CStatePersister.php(96): unserialize("a:1:{s:34:\"Yii.CSecurityManager.validationkey\";s:32:\"4f213533...")
#1 	
+
 /www/app/yiiframework/framework/base/CApplication.php(651): CStatePersister->load()
#2 	
+
 /www/app/yiiframework/framework/base/CApplication.php(591): CApplication->loadGlobalState()
#3 	
+
 /www/app/yiiframework/framework/base/CSecurityManager.php(88): CApplication->getGlobalState("Yii.CSecurityManager.validationkey")
#4 	
+
 /www/app/yiiframework/framework/base/CSecurityManager.php(270): CSecurityManager->getValidationKey()
#5 	
+
 /www/app/yiiframework/framework/base/CSecurityManager.php(237): CSecurityManager->computeHMAC("a:4:{i:0;s:1:"1";i:1;s:23:"jian.cui@kunlun-inc.com";i:2;i:259200...", null)
#6 	
+
 /www/app/yiiframework/framework/web/auth/CWebUser.php(481): CSecurityManager->hashData("a:4:{i:0;s:1:"1";i:1;s:23:"jian.cui@kunlun-inc.com";i:2;i:259200...")
#7 	
+
 /www/app/yiiframework/framework/web/auth/CWebUser.php(218): CWebUser->saveToCookie(2592000)
#8 	
–
 /www/app/legend/protected/models/LoginForm.php(71): CWebUser->login(UserIdentity, 2592000)

66             $this->_identity->authenticate();
67         }
68         if($this->_identity->errorCode===UserIdentity::ERROR_NONE)
69         {
70             $duration=$this->rememberMe ? 3600*24*30 : 0; // 30 days
71             Yii::app()->user->login($this->_identity,$duration);
72             return true;
73         }
74         else
75             return false;
76     }

#9 	
–
 /www/app/legend/protected/controllers/SiteController.php(93): LoginForm->login()

88         // collect user input data
89         if(isset($_POST[\'LoginForm\']))
90         {
91             $model->attributes=$_POST[\'LoginForm\'];
92             // validate user input and redirect to the previous page if valid
93             if($model->validate() && $model->login())
94             {
95                 $userInfo = SecurityUsers::model()->findByAttributes(array(\'username\'=>$model->username));
96                 
97                 if ($userInfo->status == 1)
98                 {

#10 	
+
 /www/app/yiiframework/framework/web/actions/CInlineAction.php(50): SiteController->actionLogin()
#11 	
+
 /www/app/yiiframework/framework/web/CController.php(300): CInlineAction->runWithParams(array("r" => "site/login"))
#12 	
+
 /www/app/yiiframework/framework/web/CController.php(278): CController->runAction(CInlineAction)
#13 	
+
 /www/app/yiiframework/framework/web/CController.php(257): CController->runActionWithFilters(CInlineAction, array())
#14 	
+
 /www/app/yiiframework/framework/web/CWebApplication.php(277): CController->run("login")
#15 	
+
 /www/app/yiiframework/framework/web/CWebApplication.php(136): CWebApplication->runController("site/login")
#16 	
+
 /www/app/yiiframework/framework/base/CApplication.php(158): CWebApplication->processRequest()
#17 	
–
 /www/app/legend/index.php(11): CApplication->run()

06 defined(\'YII_DEBUG\') or define(\'YII_DEBUG\',TRUE);
07 // specify how many levels of call stack should be shown in each log message
08 defined(\'YII_TRACE_LEVEL\') or define(\'YII_TRACE_LEVEL\',3);
09 require_once($yii);
10 
11 Yii::createWebApplication($config)->run();
12 

2011-10-21 17:14:33 nginx/1.0.0 Yii Framework/1.1.8
程序日志
时间 	等级 	类别 	信息
17:14:33.274525 	trace 	system.db.CDbConnection 	

Opening DB connection
in /www/app/legend/protected/models/SecurityUsers.php (35)
in /www/app/legend/protected/components/UserIdentity.php (22)
in /www/app/legend/protected/models/LoginForm.php (52)

17:14:33.276328 	trace 	system.db.CDbCommand 	

Querying SQL: SHOW COLUMNS FROM `l_security_users`
in /www/app/legend/protected/models/SecurityUsers.php (35)
in /www/app/legend/protected/components/UserIdentity.php (22)
in /www/app/legend/protected/models/LoginForm.php (52)

17:14:33.279325 	trace 	system.db.CDbCommand 	

Querying SQL: SHOW CREATE TABLE `l_security_users`
in /www/app/legend/protected/models/SecurityUsers.php (35)
in /www/app/legend/protected/components/UserIdentity.php (22)
in /www/app/legend/protected/models/LoginForm.php (52)

17:14:33.279913 	trace 	system.db.ar.CActiveRecord 	

SecurityUsers.find()
in /www/app/legend/protected/components/UserIdentity.php (22)
in /www/app/legend/protected/models/LoginForm.php (52)
in /www/app/legend/protected/controllers/SiteController.php (93)

17:14:33.280759 	trace 	system.db.CDbCommand 	

Querying SQL: SELECT * FROM `l_security_users` `t` WHERE LOWER(email=?)
LIMIT 1. Bound with 0='jian.cui@kunlun-inc.com'
in /www/app/legend/protected/components/UserIdentity.php (22)
in /www/app/legend/protected/models/LoginForm.php (52)
in /www/app/legend/protected/controllers/SiteController.php (93)