cannot import to FLUEN
 

HI, everyone.

When import my mesh from ICEM to FLUENT, the window says:
'Error: This appears to be a surface mesh.
Surface meshes cannot be read under the /file/read-case functionality.
Reading Cells: failed while reading section 12.
Clearing partially read grid.
Error: Read_Grid_Section: Aborted due to critical error.
Error Object: #f
Error: Error reading "Z:\CFD 2\ICEM parts\fluent.L=H.msh".
Error Object: #f'

Does anyone know why? How could I do it?

weird. it is like you don't have 3d element (volume mesh) inside. did you assign a boundary condition of "fluid" in the output menu ?

No, I haven't assign a boundary condition of "fluid" in the output menu, do I need to do this? Or could I edit boundary conditions in the FLUENT?
And this is a 2D mesh.