Method "addJqueryLibrary" is not defined in "Magentothem_Upsellslider_Model_Layout_Generate_Observer"

#0 /var/www/fixmypram.co.uk/app/code/core/Mage/Core/Model/App.php(1340): Mage::throwException('Method "addJque...')
#1 /var/www/fixmypram.co.uk/app/code/core/Mage/Core/Model/App.php(1317): Mage_Core_Model_App->_callObserverMethod(Object(Magentothem_Upsellslider_Model_Layout_Generate_Observer), 'addJqueryLibrar...', Object(Varien_Event_Observer))
#2 /var/www/fixmypram.co.uk/app/Mage.php(451): Mage_Core_Model_App->dispatchEvent('controller_acti...', Array)
#3 /var/www/fixmypram.co.uk/app/code/core/Mage/Core/Controller/Varien/Action.php(351): Mage::dispatchEvent('controller_acti...', Array)
#4 /var/www/fixmypram.co.uk/app/code/core/Mage/Core/Controller/Varien/Action.php(269): Mage_Core_Controller_Varien_Action->generateLayoutBlocks()
#5 /var/www/fixmypram.co.uk/app/code/core/Mage/Contacts/controllers/IndexController.php(53): Mage_Core_Controller_Varien_Action->loadLayout()
#6 /var/www/fixmypram.co.uk/app/code/core/Mage/Core/Controller/Varien/Action.php(418): Mage_Contacts_IndexController->indexAction()
#7 /var/www/fixmypram.co.uk/app/code/core/Mage/Core/Controller/Varien/Router/Standard.php(254): Mage_Core_Controller_Varien_Action->dispatch('index')
#8 /var/www/fixmypram.co.uk/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/fixmypram.co.uk/app/code/core/Mage/Core/Model/App.php(354): Mage_Core_Controller_Varien_Front->dispatch()
#10 /var/www/fixmypram.co.uk/app/Mage.php(687): Mage_Core_Model_App->run(Array)
#11 /var/www/fixmypram.co.uk/index.php(92): Mage::run('', 'store')
#12 {main}