Attribute Error

[prosper-20]

i'm currently having issues with the last few minutes of the video. i'm trying to make payment so that the card can be saved but i keep getting a django attribute error message on the page. The funny thing is on my stripe logs, the order status returns 200(OK) but the web page displays an attribute error "sources". This is where the error seems to be occuring: "customer.sources.create(source=token)".