Sửa lỗi dùm với mọi người

Lỗi gì đây ạ!!!
Undefined variable: errno

1. XenForo_Application::handlePhpError() in Zend/Http/Client/Adapter/Socket.php at line 236
2. Zend_Http_Client_Adapter_Socket->connect() in Zend/Http/Client.php at line 973
3. Zend_Http_Client->request() in Zend/Service/ReCaptcha.php at line 487
4. Zend_Service_ReCaptcha->_post() in Zend/Service/ReCaptcha.php at line 502
5. Zend_Service_ReCaptcha->verify() in XenForo/Captcha/ReCaptcha.php at line 53
6. XenForo_Captcha_ReCaptcha->isValid() in XenForo/Captcha/Abstract.php at line 128
7. XenForo_Captcha_Abstract::validateDefault() in XenForo/ControllerPublic/Register.php at line 164
8. XenForo_ControllerPublic_Register->actionRegister() in XenForo/FrontController.php at line 310
9. XenForo_FrontController->dispatch() in XenForo/FrontController.php at line 132
10. XenForo_FrontController->run() in /home/vol13/byethost18.com/b18_11304211/htdocs/index.php at line 13

 

bạn hỏi thế này thì ai trả lời đc đây

Biến errno ko đc xác định ....