Meshing Error

Hello,
I am trying to simulate a Centrifugal Pump. It is showing the following error. Could someone tell what it means and tell me what to do about it? The pic is attached


Thanks

Hello pratiks,

can you please share the project with the forum so we can look at it?
from what I can see from the image, I guess that the faces in the MRF zone might also be included in the wall boundary condition. Please check that boundary condition.

Best regards
Sebastian