left-handed faces on the sliding interface
 

hi guys,

I am simulating a 3D centrifugal compressor, at first I got a convergence solution with steady mode, (moving reference) and now I wanna simulate in unsteady mode, (mesh motion).
when I wanna check the rotation before running,(mesh motion preview), I face with this warning in fluent:

Warning: Failed to correct face handedness of 520 out of 672 left-handed faces on the sliding interface zone 29.

any suggestion ?

Many thanks,