Error viewing products (on frontend only) after new theme installation- Invalid method Mage_Catalog_Block_Product_View::_isSecure(Array ( ) )

Hello, I'm looking for someone to fix an error I received after I installed a new theme. When I try to "quick view" or "view" the product page on the frontend, I get the following error for every product: Invalid method Mage_Catalog_Block_Product_View::_isSecure(Array ( ) ) #0 /home/nerolina/public_html/app/design/frontend/athlete/default/template/olegnax/ajaxcart/catalog/product/[login to view URL](54): Varien_Object->__call('_isSecure', Array) #1 /home/nerolina/public_html/app/design/frontend/athlete/default/template/olegnax/ajaxcart/catalog/product/[login to view URL](54): Mage_Catalog_Block_Product_View->_isSecure() #2 /home/nerolina/public_html/app/code/core/Mage/Core/Block/[login to view URL](241): include('/home/nerolina/...') #3 /home/nerolina/public_html/app/code/core/Mage/Core/Block/[login to view URL](272): Mage_Core_Block_Template->fetchView('frontend/athlet...') #4 /home/nerolina/public_html/app/code/core/Mage/Core/Block/[login to view URL](286): Mage_Core_Block_Template->renderView() #5 /home/nerolina/public_html/app/code/core/Mage/Core/Block/[login to view URL](919): Mage_Core_Block_Template->_toHtml() #6 /home/nerolina/public_html/app/code/core/Mage/Core/Block/Text/[login to view URL](43): Mage_Core_Block_Abstract->toHtml() #7 /home/nerolina/public_html/app/code/core/Mage/Core/Block/[login to view URL](919): Mage_Core_Block_Text_List->_toHtml() #8 /home/nerolina/public_html/app/code/core/Mage/Core/Block/[login to view URL](637): Mage_Core_Block_Abstract->toHtml() #9 /home/nerolina/public_html/app/code/core/Mage/Core/Block/[login to view URL](581): Mage_Core_Block_Abstract->_getChildHtml('content', true) #10 /home/nerolina/public_html/app/design/frontend/base/default/template/page/[login to view URL](41): Mage_Core_Block_Abstract->getChildHtml('content') #11 /home/nerolina/public_html/app/code/core/Mage/Core/Block/[login to view URL](241): include('/home/nerolina/...') #12 /home/nerolina/public_html/app/code/core/Mage/Core/Block/[login to view URL](272): Mage_Core_Block_Template->fetchView('frontend/base/d...') #13 /home/nerolina/public_html/app/code/core/Mage/Core/Block/[login to view URL](286): Mage_Core_Block_Template->renderView() #14 /home/nerolina/public_html/app/code/core/Mage/Core/Block/[login to view URL](919): Mage_Core_Block_Template->_toHtml() #15 /home/nerolina/public_html/app/code/core/Mage/Core/Model/[login to view URL](555): Mage_Core_Block_Abstract->toHtml() #16 /home/nerolina/public_html/app/code/core/Mage/Core/Controller/Varien/[login to view URL](390): Mage_Core_Model_Layout->getOutput() #17 /home/nerolina/public_html/app/code/core/Mage/Cms/Helper/[login to view URL](137): Mage_Core_Controller_Varien_Action->renderLayout() #18 /home/nerolina/public_html/app/code/core/Mage/Cms/Helper/[login to view URL](52): Mage_Cms_Helper_Page->_renderPage(Object(Mage_Cms_IndexController), 'no-route') #19 /home/nerolina/public_html/app/code/core/Mage/Cms/controllers/[login to view URL](75): Mage_Cms_Helper_Page->renderPage(Object(Mage_Cms_IndexController), 'no-route') #20 /home/nerolina/public_html/app/code/core/Mage/Core/Controller/Varien/[login to view URL](418): Mage_Cms_IndexController->noRouteAction() #21 /home/nerolina/public_html/app/code/core/Mage/Core/Controller/Varien/Router/[login to view URL](250): Mage_Core_Controller_Varien_Action->dispatch('noRoute') #22 /home/nerolina/public_html/app/code/core/Mage/Core/Controller/Varien/[login to view URL](172): Mage_Core_Controller_Varien_Router_Standard->match(Object(Mage_Core_Controller_Request_Http)) #23 /home/nerolina/public_html/app/code/core/Mage/Core/Model/[login to view URL](354): Mage_Core_Controller_Varien_Front->dispatch() #24 /home/nerolina/public_html/app/[login to view URL](684): Mage_Core_Model_App->run(Array) #25 /home/nerolina/public_html/[login to view URL](88): Mage::run('', 'store') #26 {main} I need someone to fix this error, and make sure that the website still runs smoothly after this error is fixed.