dedecms をインストールした後、バックグラウンドのログイン インターフェイスが空白になった場合はどうすればよいですか?

1 if (!isset($_SESSION[$this->keepUserIDTag]))
 2 //@session_register($this->keepUserIDTag);    
 3 $_SESSION[$this->keepUserIDTag] = $this->userID;
 4 
 5 if (!isset($_SESSION[$this->keepUserTypeTag]))
 6 //@session_register($this->keepUserTypeTag);
 7 $_SESSION[$this->keepUserTypeTag] = $this->userType;
 8 
 9 if (!isset($_SESSION[$this->keepUserChannelTag]))
10 //@session_register($this->keepUserChannelTag);
11 $_SESSION[$this->keepUserChannelTag] = $this->userChannel;
12 
13 if (!isset($_SESSION[$this->keepUserNameTag]))
14 //@session_register($this->keepUserNameTag);
15 $_SESSION[$this->keepUserNameTag] = $this->userName;
16 
17 if (!isset($_SESSION[$this->keepUserPurviewTag]))
18 //@session_register($this->keepUserPurviewTag);
19 $_SESSION[$this->keepUserPurviewTag] = $this->userPurview;
20 
21 if (!isset($_SESSION[$this->keepAdminStyleTag]))
22 //@session_register($this->keepAdminStyleTag);
23 $_SESSION[$this->keepAdminStyleTag] = $adminstyle;