ERROR : expected Array to be a Hash: attributes: expected Array to be a Hash: attributes

[Victordelfosse]

Hello,

Since yesterday, as soon as a customer wants to pay (checkout step by pressing the button), an error page appears.

"expected Array to be a Hash: attributes: expected Array to be a Hash: attributes"

I have no idea how to solve this very urgent problem, could someone help me?

Thanks in advance.

Best regards, 

Victor