Yeah that is failing because your impersonation files doesn't have proper priviledges mapping defined.
The correct way to do it is to define content in silent installation files - "nsh-install-defaults" for *unix and "rscd.iss" for windows, and then run your rscd installation. This will create correct impersonation files in first shot. Otherwise if you have done it with a blank silent install file, or without the silent install file, then you will have to manually edit the impersonation files exports, users.local.
You can find reference to the silent installation files for rscd agent in the bladelogic installation guide