The mesh generation did not complete due to poor quality elements or incorrect input. Please try meshing with another mesh method or different mesh options.
Delete the three items under the Mesh.
Does the geometry mesh with just the Mesh without any additions?
Set the element size to 1 mm. Does that improve the mesh?
this happened again and again. I made this part in catia and apply boolean operation too.
What file format did you save the part in from Catia?
Try exporting the geometry as STEP and Parasolid.
Open SpaceClaim and use the various repair tools to check the quality of the geometry.
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