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当我尝试将我的 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'3-键 'entity_type_id' 的缩略图'

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}
4

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