Long exposoure problem with K5

Hi,

After a long time with white sky here we got some clear sky with stars dancing up there. I put the K5 on a tripod for a long exposure. After about one hour I closed the shutter and waited for the camera to process the image. i waited outside for ages but nothing happened. I took off the camera from the tripod and brought it in. I see that a message blinking --- 999" nr ---- Does anybody know what the hell is going on? it is now half an hour the camera is in this situation. The weather outside is
-1 Celsius.