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Original thread title: We couldn't find the submission you are looking for on our servers.
Where and when do you see this error message?
I tried doing a test submission on your direct form and the form embedded on your webpage. It was successful, I didn't see any error message. It just redirects me to the Paypal checkout page.
You can also try checking the incomplete payments, probably the submission can be found there. Here' a guide: http://www.jotform.com/help/135-How-to-View-Incomplete-Payments
If this is not what you need then please provide more details about your issue so we can assist you properly. Thank you.