Cube throws an error while browsing

Hi,
One of cubes when browsed through proclarity showed
nothing. To debug the same, I browsed through analysis
services and the values were "#ERR". There was no
change to the structure of the cube. The cube
processing log shows that the cube was refreshed
successfully.
I then again reprocessed the cube in "Refresh" mode and
it worked fine.
Any clue of why had this happen to just one of the cube?
I was fortunate that this happenned to a smaller cube,
otherwise I would have been to a toss?
Any advice?
Thanks,
Lakshman.
if double click on #ERR, what error you see?
Wei Zhang
Microsoft OLAP Support