Hi,

This is something at paypal's end unfortunately they do not share with us what went wrong or why, this is done to protect your privacy but it can be bloody annoying when it comes to finding out why an issue is occurring.

Have you tried to put the payment through more than once? Most likely this was just a glitch at paypal it happens from time to time. It should go through fine now. Please let me know if it does not and I'll look into it further for you.

Sorry about the hassle it's not meant to be this difficult.
Regards
David