SSAS 2005 v9.00.2047.00

I'm trying to create ROLAP proactive caching for dimension (my
dimension might be changing often and I'd like to reflect the real
data in my queries).
After processing, I tried an MDX that slices the cube using the above
dimension, and this is what I got:

Internal error: An unexpected error occurred (file 'mdrolapfilter.cpp',
line 125, function 'MDRolapFilter::Init').

Is this a known bug?

Thanks,
Haggai