Trouble starting my simulation: ERROR: NO CARTESIAN GRID BOUNDARY CONDITION SPECIFIED

Hi all
When I mess my geometry it seems to me the following message: ERROR cartesian_grid\get_stl_data.f:671
ERROR: NO CARTESIAN GRID BOUNDARY CONDITION SPECIFIED.
AT LEAST ONE BC_TYPE MUST START WITH CG (FOR EXAMPLE CG_NSW)
RUN ABORTED

What is the reason for this problem to occur?
Thanks

What’s the boundary condition for stl wall?
If it is no_slip, you should use CG_NSW.