我有我的商店的开发副本，每当我尝试将产品添加到购物车时，我都会收到如下错误：
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其次是这个堆栈：
Fatal error: Call to a member function saveAttributeData() on a non-object in C:\wamp\www\localdevsite\app\code\core\Enterprise\Customer\Model\Observer.php on line 86
Call Stack
# Time Memory Function Location
1 0.0010 162576 {main}( ) ..\index.php:0
2 0.0080 349224 Mage::run( ) ..\index.php:86
3 0.0200 1004104 Mage_Core_Model_App->run( ) ..\Mage.php:683
4 1.9282 7392840 Mage_Core_Controller_Varien_Front->dispatch( ) ..\App.php:354
5 1.9452 7613744 Mage_Core_Controller_Varien_Router_Standard->match( ) ..\Front.php:176
6 1.9522 8053616 Mage_Core_Controller_Varien_Action->dispatch( ) ..\Standard.php:250
7 2.2102 10787248 Zeon_Customcheckout_CartController->addAction( ) ..\Action.php:419
8 5.2795 20007880 Mage_Checkout_Model_Cart->save( ) ..\CartController.php:145
9 6.1246 26354824 Mage_Sales_Model_Quote->save( ) ..\Cart.php:465
10 6.1246 26354848 Mage_Core_Model_Abstract->save( ) ..\Quote.php:1898
11 6.2006 26485984 Mage_Sales_Model_Quote->_afterSave( ) ..\Abstract.php:319
12 6.2006 26486072 Mage_Core_Model_Abstract->_afterSave( ) ..\Quote.php:324
13 6.2006 26486704 Mage::dispatchEvent( ) ..\Abstract.php:466
14 6.2006 26486704 Mage_Core_Model_App->dispatchEvent( ) ..\Mage.php:447
15 6.2016 26498584 Mage_Core_Model_App->_callObserverMethod( ) ..\App.php:1317
16 6.2016 26498584 Enterprise_Customer_Model_Observer->salesQuoteAfterSave( ) ..\App.php:1338
到目前为止，其他一切都在该站点上运行，并且这些产品在生产服务器上运行。我猜我的 wamp 设置有问题？有谁知道我可以从哪里开始寻找？