document.generalWP.document.recordset.options[document.generalWP.documnet.recordset.selectedIndex] has not properties.
Means that it can't connect to the database or can't find the recordset on the page that you used when applying.
The other errors are because you have added a column to the cart and haven't updated the add to cart to specify the values.
What page are you working on? Maybe I can download it and see. I currently can't access the site because of a connection error.