ERROR [Sitecore Services]: System.NullReferenceException: Object reference not set to an instance of an object.
at Sitecore.Services.Infrastructure.Sitecore.Handlers.CreateItemHandler.HandleRequest(CreateItemCommand request)
at Sitecore.Services.Infrastructure.Sitecore.Controllers.ItemServiceController.ProcessRequest[T](Func`2 handler, HandlerRequest query)

$('#MyButton').click(function() {
    var url = "/sitecore/api/ssc/item/sitecore%2Fcontent%2F%home%2FMy%20Folder";

    $.ajax({
        method: "POST",
        contentType: "application/json",
        url: url,
        data: {
            ItemName: "TemporaryTestFile",
            TemplateID: "982F124F-B871-42DD-9915-D5411BFF8715"
        },
        success: function() {
            alert('success');
        },
        error: function(xhr, status, error) {
            alert(xhr.status + ' - ' + error);
        }
    });
});