Product is not loaded

#0 /domains/networldsports.co.uk/.modman/firebear_improved-configurable-product/app/code/community/Firebear/ConfigUrl/Model/Observer.php(68): Mage_Catalog_Helper_Product_View->prepareAndRender('16572', Object(Mage_Catalog_ProductController), Object(Varien_Object))
#1 /domains/networldsports.co.uk/.modman/firebear_improved-configurable-product/app/code/community/Firebear/ConfigUrl/Model/Observer.php(158): Firebear_ConfigUrl_Model_Observer->_prepareAndRender(Object(Mage_Catalog_ProductController), '16572', Array)
#2 /domains/networldsports.co.uk/http/app/code/core/Mage/Core/Model/App.php(1374): Firebear_ConfigUrl_Model_Observer->forwardToConfigurable(Object(Varien_Event_Observer))
#3 /domains/networldsports.co.uk/http/app/code/core/Mage/Core/Model/App.php(1347): Mage_Core_Model_App->_callObserverMethod(Object(Networld_ProductImproved_Model_Observer), 'forwardToConfig...', Object(Varien_Event_Observer))
#4 /domains/networldsports.co.uk/http/app/Mage.php(451): Mage_Core_Model_App->dispatchEvent('controller_acti...', Array)
#5 /domains/networldsports.co.uk/http/app/code/core/Mage/Core/Controller/Varien/Action.php(531): Mage::dispatchEvent('controller_acti...', Array)
#6 /domains/networldsports.co.uk/http/app/code/core/Mage/Core/Controller/Front/Action.php(69): Mage_Core_Controller_Varien_Action->preDispatch()
#7 /domains/networldsports.co.uk/http/app/code/core/Mage/Core/Controller/Varien/Action.php(407): Mage_Core_Controller_Front_Action->preDispatch()
#8 /domains/networldsports.co.uk/http/app/code/core/Mage/Core/Controller/Varien/Router/Standard.php(254): Mage_Core_Controller_Varien_Action->dispatch('view')
#9 /domains/networldsports.co.uk/http/app/code/core/Mage/Core/Controller/Varien/Front.php(172): Mage_Core_Controller_Varien_Router_Standard->match(Object(Mage_Core_Controller_Request_Http))
#10 /domains/networldsports.co.uk/http/app/code/core/Mage/Core/Model/App.php(381): Mage_Core_Controller_Varien_Front->dispatch()
#11 /domains/networldsports.co.uk/http/app/Mage.php(686): Mage_Core_Model_App->run(Array)
#12 /domains/networldsports.co.uk/http/index.php(91): Mage::run('nws_nl', 'website')
#13 {main}