The issue I'm having is similar, but not exactly the same. I, too, am receiving this error message. However, I'm only getting it on my Q system.
I have a set of source files - one for my single roles, and one for my composite roles. I've used these to load roles into my Dev system, and both loaded fine with no errors. Tested etc, 100% good to go.
Same files in the Q system results in 100% success on the single role load file. Testing shows that the role names appear within BRM. The corresponding composite role file results in the above discussed error messages for certain roles, NOT ALL ROLES.
When I examine those roles without the error message, I find them to have been loaded successfully. Composite roles have single roles listed in them.
When I examine those roles WITH the error message, I find them to not have any single role name listed.
I've re-run the authorization sync job and have confirmed that all the roles associated with the composite roles in fact are available in the Q system.
At this point, I'm not sure why these roles are not loading, as I feel certain the data load template files are without any problem.
Thanks,
Santosh