Was running quite nicely till this happened

2013-08-07 09:40:03,243 [ERROR] HTTPError, can't update market: BitstampUSD
2013-08-07 09:40:03,244 [WARNING] Market: BitstampUSD order book is expired
2013-08-07 09:40:03,964 [ERROR] HTTPError, can't update market: BitstampUSD
2013-08-07 09:40:03,965 [WARNING] Market: BitstampUSD order book is expired
2013-08-07 09:40:24,738 [ERROR] HTTPError, can't update market: BitstampUSD
2013-08-07 09:40:24,739 [WARNING] Market: BitstampUSD order book is expired
2013-08-07 09:40:25,604 [ERROR] HTTPError, can't update market: BitstampUSD
2013-08-07 09:40:25,605 [WARNING] Market: BitstampUSD order book is expired

I was able to login to bitstamp  via the website,
so did not seen offiline

hope you can help

thank you