当我尝试将Magento版本从1.4升级到1.7时，我收到以下错误。 请帮忙
文件错误：“/ home / public_html/app/code/core/Mage/XmlConnect/sql/xmlconnect_setup/mysql4-install-1.4.0.8.php” - SQLSTATE [23000]：完整性约束违规：1062重复条目'entity_type_id'重复输入'3-thumbnail'
Trace:
0 /home/public_html/app/code/core/Mage/Core/Model/Resource/Setup.php(390):
Mage::exception('Mage_Core', 'Error in file: ...')
/home/public_html/app/code/core/Mage/Core/Model/Resource/Setup.php(276):
Mage_Core_Model_Resource_Setup->_modifyResourceDb('install', '', '1.6.0.0')
2 /home/public_html/app/code/core/Mage/Core/Model/Resource/Setup.php(240):
Mage_Core_Model_Resource_Setup->_installResourceDb('1.6.0.0')
3 /home/public_html/app/code/core/Mage/Core/Model/Resource/Setup.php(161):
Mage_Core_Model_Resource_Setup->applyUpdates()
4 /home/public_html/app/code/core/Mage/Core/Model/App.php(363):
Mage_Core_Model_Resource_Setup::applyAllUpdates()
5 /home/public_html/app/code/core/Mage/Core/Model/App.php(295):
Mage_Core_Model_App->_initModules()
6 /home/public_html/app/Mage.php(596): Mage_Core_Model_App->run(Array)
7 /home/public_html/index.php(82): Mage::run('', 'store')
8 {main}