(tried to delete my first post, dont know if it worked. ignore that one..)

Im new to tea commerce and trying to do very basic stuff. Im trying to add orderlines to an order with JS but it doesnt work. When I click my Add to cart button I get this error in chrome console "POST http://mydomain/FormPost.aspx 500 (Internal Server Error)". Ive added productName,productNumber,productPrice to "Product property aliases" in Products and they are filled out on every product.

Here's my markup (razor):

@foreach (var product in Model.Content.Children)
{
    <div class="product">
        <h3>@product.Name</h3>
        <img src="@Umbraco.Media(@product.GetProperty("pic").Value).Url" alt="" />
        <a class="productAddToCart" id="@product.Id">köp</a>
        <span class="price">pris: @product.GetProperty("productPriceSwe").Value kr</span>
    </div>
}

and my JS:

(function () {

/* add product to cart */
$(".productAddToCart").on("click", function (e) {

var nodeId = $(this).attr('id');

/* Add orderline is called using the Tea Commerce javascript API */
TC.addOrUpdateOrderLine({
    productIdentifier: nodeId, quantity: 3,storeId:1,

    errorfn: function (e) {
        console.log(e);
    },

    successfn: function (e) {
        console.log(e);
    }
});

e.preventDefault();
});

})();

Any ideas? im lost :(