I copied the SQL Server 2005 Analysis Services (BI) project to my local computer and was trying to process one of the cubes using the SQL Server Business Intelligence Development Studio.
After I had configured the database connection properties and the target Analysis Services database properties, I started the cube processing.
After a short while I got the following error message:
The following system error occurred: No mapping between account names and security IDs was done.
I opened related Roles item (olap.role) within the OLAP project, I opened the Membership tab. There was a user group named "Olap" which was not defined in my local computer.
To solve the issue I created the local user group named "Olap" on my local computer where the BI project is currently running, and I added my user to this local user group.