Php 卸载扩展插件后，magento管理面板显示注册表项错误

我卸载了magento扩展，我的magento管理员开始显示：错误

处理您的请求时出错

Mage registry key "_singleton/tmcore/observer" already exists

Trace:
#0 /var/www/clients/client1/web7/web/app/Mage.php(223): Mage::throwException('Mage registry k...')
#1 /var/www/clients/client1/web7/web/app/Mage.php(477): Mage::register('_singleton/tmco...', false)
#2 /var/www/clients/client1/web7/web/app/code/core/Mage/Core/Model/App.php(1316): Mage::getSingleton('tmcore/observer')
#3 /var/www/clients/client1/web7/web/app/Mage.php(448): Mage_Core_Model_App->dispatchEvent('controller_acti...', Array)
#4 /var/www/clients/client1/web7/web/app/code/core/Mage/Core/Controller/Varien/Action.php(527): Mage::dispatchEvent('controller_acti...', Array)
#5 /var/www/clients/client1/web7/web/app/code/core/Mage/Adminhtml/Controller/Action.php(160): Mage_Core_Controller_Varien_Action->preDispatch()
#6 /var/www/clients/client1/web7/web/app/code/core/Mage/Core/Controller/Varien/Action.php(407): Mage_Adminhtml_Controller_Action->preDispatch()
#7 /var/www/clients/client1/web7/web/app/code/core/Mage/Core/Controller/Varien/Router/Standard.php(250): Mage_Core_Controller_Varien_Action->dispatch('login')
#8 /var/www/clients/client1/web7/web/app/code/core/Mage/Core/Controller/Varien/Front.php(172): Mage_Core_Controller_Varien_Router_Standard->match(Object(Mage_Core_Controller_Request_Http))
#9 /var/www/clients/client1/web7/web/app/code/core/Mage/Core/Model/App.php(354): Mage_Core_Controller_Varien_Front->dispatch()
#10 /var/www/clients/client1/web7/web/app/Mage.php(684): Mage_Core_Model_App->run(Array)
#11 /var/www/clients/client1/web7/web/index.php(71): Mage::run('', 'store')
#12 {main}

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导致此错误的原因是什么？我如何修复它？

从magento根目录中删除“maintenance.flag”文件，它将正常工作

请不要用你的字体打我们…代码需要格式化。还要特别注意正确键入所有内容。确保还有一个问题。