Getting OLAP Cube Building to Work?

Hi,
I wonder what might be the reason behind why no members of the SASUSERS group are allowed to create OLAP Cubes. I encountered this error "The security package failed while authenticating a user". My system seems to work well, I have no error encountered in the past days, regular maintenance was observed and pretty well guarded from intruder.
After I saw that warning message, it came to my mind first to restart the system. So to have a fresh start, but it seems same thing happens as stated above. I am also wondering, what if I will remediate this to allow the SASUSERS group to have WriteMetadata Access on the OLAP Schema? Please help me by giving some suggestion regarding this issue.
Thanks!
Error
The security package failed while authenticating a user.
OK Details <<
SEC_E_INTERNAL_ERROR
The security package failed while authenticating a user.
