I have not encountered that error before and cannot find any reference to it in the PaayPal Documentation.
I would contact paypal support to determine what the problem is.
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.