Step-by-Step Tutorial Session 4 - Design Process

I was trying to mesh with the given front wing model. STL files were created on Onshape. I repeated the steps twice. But i got the same errors.
Illegal triangles were found after surface tesselation. There could be a problem with the CAD geometry. Trying to proceed anyway.
The tesselated surface is not closed. There could be a problem with the CAD geometry (such as self-intersections).
Please inspect your geometry. Trying to proceed anyway.
Creation of the following cell zone might not succeed. Assigned entities are not closed: RadiatorZone
Mesh quality check failed. The mesh is not OK.
The models seems okay and there isn’t any intersection. Please help.
Project Link: https://www.simscale.com/workbench/?pid=7357782618357268936#tab_0-0

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