POSSIBLE REASON: When employing the My Shopping Cart feature on our site, we will send your computer a "cookie" that stores the items you have added to your basket. Our cookies do not store any personal identifying information and none of our cookies ever live beyond the end of a single user's session. If you have set your browser to block cookies then the My Shopping Cart feature will not work and you will receive this message each time you try to add an item to your Shopping Cart.
SOLUTION: Set your browser to accept cookies while you are shopping with us. When you are done you can set you browser back to block cookies.