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Server Error

Validate class not found from basename 'EmailAddress'
1.Zend_Validate::is() in XenForo/DataWriter/User.php at line 572
2.XenForo_DataWriter_User->_verifyEmail()
3.call_user_func_array() in XenForo/DataWriter.php at line 965
4.XenForo_DataWriter->_runVerificationCallback() in XenForo/DataWriter.php at line 720
5.XenForo_DataWriter->_isFieldValueValid() in XenForo/DataWriter.php at line 638
6.XenForo_DataWriter->set() in XenForo/DataWriter.php at line 978
7.XenForo_DataWriter->bulkSet() in XenForo/Install/Model/Install.php at line 216
8.XenForo_Install_Model_Install->insertAdministrator() in XenForo/Install/Controller/Install.php at line 274
9.XenForo_Install_Controller_Install->actionStep3b() in XenForo/FrontController.php at line 310
10.XenForo_FrontController->dispatch() in XenForo/FrontController.php at line 132
11.XenForo_FrontController->run() in /home/vol14_4/byethost7.com/b7_19266441/htdocs/install/index.php at line 18

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