Magento

All in a sudden this error appears when an order is being confirmed by the customer: invalid entry_type stated: order_item

When i log into the adminpanel i get to see the following:

Invalid entry_type stated: order_item
Trace:
#0 /home/admin/domains/xxxx.nl/public_html/app/code/core/Mage/Eav/Model/Config.php(107): Mage::exception(’Mage_Eav’, ‘Ongeldig entry_...’)
#1 /home/admin/domains/xxxxxx.nl/public_html/app/code/core/Mage/Eav/Model/Entity/Abstract.php(232): Mage_Eav_Model_Config->getEntityType(’order_item’)
#2 /home/admin/domains/xxxxxx.nl/public_html/app/code/core/Mage/Sales/Model/Entity/Order/Item.php(35): Mage_Eav_Model_Entity_Abstract->setType(’order_item’)
#3 /home/admin/domains/xxxx.nl/public_html/app/code/core/Mage/Core/Model/Config.php(697): Mage_Sales_Model_Entity_Order_Item->__construct(Array)
#4 /home/admin/domains/xxxxxx.nl/public_html/app/code/core/Mage/Core/Model/Config.php(737): Mage_Core_Model_Config->getModelInstance(’sales_entity/or...’, Array)
#5 /home/admin/domains/xxxxxx.nl/public_html/app/Mage.php(322): Mage_Core_Model_Config->getResourceModelInstance(’sales/order_ite...’, Array)
#6 /home/admin/domains/xxxxxxx.nl/public_html/app/Mage.php(336): Mage::getResourceModel(’sales/order_ite...’, Array)
#7 /home/admin/domains/xxxxxxxxxx.nl/public_html/app/code/core/Mage/Reports/Model/Mysql4/Product/Collection.php(172): Mage::getResourceSingleton(’sales/order_ite...’)
#8 /home/admin/domains/xxxxxx.nl/public_html/app/code/core/Mage/Adminhtml/Block/Dashboard/Tab/Products/Ordered.php(51): Mage_Reports_Model_Mysql4_Product_Collection->addOrderedQty()
#9 /home/admin/domains/xxxxxxx.nl/public_html/app/code/core/Mage/Adminhtml/Block/Widget/Grid.php(438): Mage_Adminhtml_Block_Dashboard_Tab_Products_Ordered->_prepareCollection()
#10 /home/admin/domains/xxxxxxxx.nl/public_html/app/code/core/Mage/Adminhtml/Block/Widget/Grid.php(444): Mage_Adminhtml_Block_Widget_Grid->_prepareGrid()
#11 /home/admin/domains/xxxxxxxxxx.nl/public_html/app/code/core/Mage/Core/Block/Abstract.php(553): Mage_Adminhtml_Block_Widget_Grid->_beforeToHtml()
#12 /home/admin/domains/xxxxxxx.nl/public_html/app/code/core/Mage/Adminhtml/Block/Dashboard/Grids.php(43): Mage_Core_Block_Abstract->toHtml()
#13 /home/admin/domains/xxxxxx.nl/public_html/app/code/core/Mage/Core/Block/Abstract.php(193): Mage_Adminhtml_Block_Dashboard_Grids->_prepareLayout()
#14 /home/admin/domains/xxxxxxxx.nl/public_html/app/code/core/Mage/Core/Model/Layout.php(402): Mage_Core_Block_Abstract->setLayout(Object(Mage_Core_Model_Layout))
#15 /home/admin/domains/xxxxxx.nl/public_html/app/code/core/Mage/Adminhtml/Block/Dashboard.php(66): Mage_Core_Model_Layout->createBlock(’adminhtml/dashb...’)
#16 /home/admin/domains/xxxxxxxx.nl/public_html/app/code/core/Mage/Core/Block/Abstract.php(193): Mage_Adminhtml_Block_Dashboard->_prepareLayout()
#17 /home/admin/domains/xxxxxx.nl/public_html/app/code/core/Mage/Core/Model/Layout.php(402): Mage_Core_Block_Abstract->setLayout(Object(Mage_Core_Model_Layout))
#18 /home/admin/domains/xxxxxxx.nl/public_html/app/code/core/Mage/Adminhtml/controllers/DashboardController.php(35): Mage_Core_Model_Layout->createBlock(’adminhtml/dashb...’, ‘dashboard’)
#19 /home/admin/domains/xxxxxxxx.nl/public_html/app/code/core/Mage/Core/Controller/Varien/Action.php(342): Mage_Adminhtml_DashboardController->indexAction()
#20 /home/admin/domains/xxxxx.nl/public_html/app/code/core/Mage/Core/Controller/Varien/Router/Admin.php(148): Mage_Core_Controller_Varien_Action->dispatch(’index’)
#21 /home/admin/domains/xxxxxx.nl/public_html/app/code/core/Mage/Core/Controller/Varien/Front.php(146): Mage_Core_Controller_Varien_Router_Admin->match(Object(Mage_Core_Controller_Request_Http))
#22 /home/admin/domains/xxxxxxxx.nl/public_html/app/Mage.php(427): Mage_Core_Controller_Varien_Front->dispatch()
#23 /home/admin/domains/xxxxxxxx.nl/public_html/index.php(40): Mage::run()
#24 {main}

The store has been running fine for 5 months.... DOes anybody know what the problem is and how to fix it?
I’ve repaired the database but that didn’t do much.

This issue has been resolved.
ClamAV changed the chmod rights for some magento files and folders, resulting in strange errors.
I’ve set chmod back to 777 for all files and magento is running fine again.