Question Lỗi khi import dữ liệu vào db cho xenforo

Mình đang import dữ liệu vào db thì bị lỗi như ở dưới. Các bạn cho hỏi tại sao và cách xử lý như thế nào. Cám ơn.

An exception occurred: Mysqli prepare error: MySQL server has gone away in /var/www/html/diendan/library/Zend/Db/Statement/Mysqli.php on line 77

1. Zend_Db_Statement_Mysqli->_prepare() in Zend/Db/Statement.php at line 115
2. Zend_Db_Statement->__construct() in Zend/Db/Adapter/Mysqli.php at line 381
3. Zend_Db_Adapter_Mysqli->prepare() in Zend/Db/Adapter/Abstract.php at line 478
4. Zend_Db_Adapter_Abstract->query() in XenForo/Model.php at line 219
5. XenForo_Model->fetchAllKeyed() in XenForo/Model/AdminNavigation.php at line 31
6. XenForo_Model_AdminNavigation->getAdminNavigationEntries() in XenForo/Model/AdminNavigation.php at line 405
7. XenForo_Model_AdminNavigation->getAdminNavigationForDisplay() in XenForo/Dependencies/Admin.php at line 224
8. XenForo_Dependencies_Admin->_getNavigationContainerParams() in XenForo/Dependencies/Admin.php at line 202
9. XenForo_Dependencies_Admin->getEffectiveContainerParams() in XenForo/FrontController.php at line 616
10. XenForo_FrontController->renderView() in XenForo/FrontController.php at line 158
11. XenForo_FrontController->run() in /var/www/html/diendan/admin.php at line 13