Method "process" is not defined in ""

#0 /var/www/www.musicbros.net/htdocs/app/code/core/Mage/Core/Model/App.php(1360): Mage::throwException('Method "process...')
#1 /var/www/www.musicbros.net/htdocs/app/code/core/Mage/Core/Model/App.php(1337): Mage_Core_Model_App->_callObserverMethod(false, 'process', Object(Varien_Event_Observer))
#2 /var/www/www.musicbros.net/htdocs/app/Mage.php(451): Mage_Core_Model_App->dispatchEvent('core_collection...', Array)
#3 /var/www/www.musicbros.net/htdocs/app/code/core/Mage/Core/Model/Resource/Db/Collection/Abstract.php(586): Mage::dispatchEvent('core_collection...', Array)
#4 /var/www/www.musicbros.net/htdocs/lib/Varien/Data/Collection/Db.php(565): Mage_Core_Model_Resource_Db_Collection_Abstract->_beforeLoad()
#5 /var/www/www.musicbros.net/htdocs/app/code/core/Mage/Core/Model/Resource/Store/Collection.php(174): Varien_Data_Collection_Db->load(false, false)
#6 /var/www/www.musicbros.net/htdocs/lib/Varien/Data/Collection.php(752): Mage_Core_Model_Resource_Store_Collection->load()
#7 /var/www/www.musicbros.net/htdocs/app/code/core/Mage/Core/Model/App.php(635): Varien_Data_Collection->count()
#8 /var/www/www.musicbros.net/htdocs/app/code/core/Mage/Core/Model/App.php(477): Mage_Core_Model_App->_initStores()
#9 /var/www/www.musicbros.net/htdocs/app/code/core/Mage/Core/Model/App.php(360): Mage_Core_Model_App->_initCurrentStore('default', 'store')
#10 /var/www/www.musicbros.net/htdocs/app/Mage.php(686): Mage_Core_Model_App->run(Array)
#11 /var/www/www.musicbros.net/htdocs/index.php(111): Mage::run('default', 'store')
#12 {main}