Fix errors on Joomla/K2 store website

Hi, I bought a Joomla template with K2 store. Everything was working fine until yesterday. The k2 store checkout page is not working anymore ([login to view URL]). When I activate the error reporting feature of Joomla, I get this error message on that page: Strict Standards: Only variables should be assigned by reference in /home/mywebsite/public_html/components/com_k2store/[login to view URL] on line 18 Strict Standards: Only variables should be assigned by reference in /home/mywebsite/public_html/components/com_k2store/helpers/[login to view URL] on line 35 Strict Standards: Only variables should be assigned by reference in /home/mywebsite/public_html/components/com_k2store/helpers/[login to view URL] on line 36 Strict Standards: Non-static method K2StoreStrapper::addJS() should not be called statically in /home/mywebsite/public_html/components/com_k2store/[login to view URL] on line 22 Strict Standards: Non-static method K2StoreStrapper::addCSS() should not be called statically in /home/mywebsite/public_html/components/com_k2store/[login to view URL] on line 23 Strict Standards: Declaration of K2StoreControllerCheckout::display() should be compatible with K2StoreController::display($cachable = false, $urlparams = Array) in /home/mywebsite/public_html/components/com_k2store/controllers/[login to view URL] on line 21 Strict Standards: Declaration of K2StoreTable::save() should be compatible with JTable::save($src, $orderingFilter = '', $ignore = '') in /home/mywebsite/public_html/administrator/components/com_k2store/tables/[login to view URL] on line 401 Fatal error: Declaration of TableOrders::store() must be compatible with JTableInterface::store($updateNulls = false) in /home/mywebsite/public_html/administrator/components/com_k2store/tables/[login to view URL] on line 21 I need someone to fix that as soon as possible. NOT TIME WASTERS PLEASE, ONLY BID IF YOU CAN SOLVE THIS QUICKLY. Thank you Regards Lary