Parameter #4 $productBundleItems (Doctrine\Common\Collections\Collection<int, BitBag\SyliusProductBundlePlugin\Command\AddProductBundleItemToCartCommand>) of method BitBag\SyliusProductBundlePlugin\Factory\AddProductBundleToCartCommandFactory::createNew() should be compatible with parameter $productBundleItems (Doctrine\Common\Collections\Collection<int, BitBag\SyliusProductBundlePlugin\Entity\ProductBundleOrderItemInterface>) of method BitBag\SyliusProductBundlePlugin\Factory\AddProductBundleToCartCommandFactoryInterface::createNew()

Cannot call method getCode() on Sylius\Component\Core\Model\ProductVariantInterface|null.

Method BitBag\SyliusProductBundlePlugin\Provider\AddProductBundleItemToCartCommandProvider::provide() should return Doctrine\Common\Collections\Collection<int, BitBag\SyliusProductBundlePlugin\Command\AddProductBundleItemToCartCommand> but return statement is missing.

Process completed with exit code 1.