I add snipcart on my website but

Hello everyones,

I have a problem with Snipcart (I use grav snipcart plugin) I configurated all my web site and add products, all seem almost work fine in test mode, but at the end of checkout I have a message for notify me all products selected seem not available, do you know why snipcart tell me that ?

Here the error message after i clicked on "Place order" buttton (FYI : I'm in test mode)

thank's in advance
Serge