Gravity Forms Stripe

Hi there, I was hoping that somebody may be able to assist me please. This is the first time that I have had a website with a payment option on it and have opted to use Gravity Forms + Stripe. Please note that I do not know coding however, I tried to TEST a payment via Stripe with their testing visa details, and I have the plugin set to TEST however, when I tried I received the following :

Invalid source object: must be a dictionary or a non-empty string

What exactly does that mean please? Is this something to do with the plugin, or is this something that I need to refer to Stripe?

I am using a Studio Press theme of Daily Dish, if that is of assistance to anybody. Also, when payment is processed, the client is then taken to another Gravity Form to complete further details, so could that be the issue, i.e. because of the unique coding of the Stripe facility, does the Stripe payment have to be on the last form for processing?

Any help that can be offered would be greatly appreciated.

Thank you.