The File Replication Service could not grant an unknown user access to the API "%1". Access checks can be disabled for "%1" by running regedt32. Click Start, Run, and type regedt32. Click the window entitled HKEY_LOCAL_MACHINE. Double click on SYSTEM, CurrentControlSet, Services, NtFrs, Parameters, Access Checks, "%1", and "%2". Change the string to Disabled. Permissions can be changed by highlighting "%1" and then clicking on the toolbar option Security, and then Permissions.