Hi AnGus,
From my reading of the source code, it looks like this error message is generated when you set the value of receiver_type to a value other than zero. The value of that variable in your CSV file is set to one -- changing it to zero should fix the problem.
That variable is a placeholder for a cavity receiver, which is not currently implemented for the molten salt power tower SSC module -- it can only model an external receiver.
Sorry it took me so long to get back to you on this.
Best regards,
Paul.