Can rezolve This Error?

[Cosmin T.]

Whoops, looks like something went wrong.1/1ContextErrorException in Cart.php line 3558:Notice: Undefined index:

 

in Cart.php line 3558at ErrorHandler->handleError('8', 'Undefined index: ', '/home/rubatoxq/public_html/presta17/classes/Cart.php', '3558', array('products' => null)) in Cart.php line 3558at CartCore->getTotalWeight() in fancourier.php line 865at fancourier->getOrderShippingCost(object(Cart), '0') in Cart.php line 3499at CartCore->getPackageShippingCost('94', true, null, null, '1') in Carrier.php line 736at CarrierCore::getCarriersForOrder('1', array('3'), object(Cart), array()) in Carrier.php line 1528at CarrierCore::getAvailableCarrierList(object(Product), '0', '22', null, object(Cart)) in Cart.php line 2315at CartCore->getPackageList(false) in Cart.php line 2525at CartCore->getDeliveryOptionList(null) in Cart.php line 3073at CartCore->getDeliveryOption(null, false, false) in Cart.php line 3141at CartCore->getTotalShippingCost(null, false) in Cart.php line 1802at CartCore->getOrderTotal(false) in CartPresenter.php line 287at CartPresenter->present(object(Cart)) in OrderPresenter.php line 114at OrderPresenter->getProducts(object(Order)) in OrderPresenter.php line 87at OrderPresenter->present(object(Order)) in OrderConfirmationController.php line 83at OrderConfirmationControllerCore->initContent() in Controller.php line 205at ControllerCore->run() in Dispatcher.php line 369at DispatcherCore->dispatch() in index.php line 28

[polosat]

It seems to be related to fancourier module. Try to disable it (or its carrier) and check if it helps.