Please see the bugtracker, there have been several issues related to resellers already been closed and will be released with 3.0.2. Beside that, the above error can only happen if you added system users manually. Instead of adding a system user, you always have to add a client or reseller. System users can not be added manually. If you add them manually, you get the above error message as no client or reseller record is assigned to the system user then.
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