Ebay-Buyer no longer registered????

I just had an item that sold a couple of days ago and I am still waiting for payment, but ebay is telling me the buyer is no longer registered with them? What does that mean, and does it mean I need to start the auction all over again.... I had other bidders interested?

I would do a second chance offer since eBay is saying they are no longer registered.

thanks for the response- I am new to all of this ;)

No problem. Happy selling & good luck.