Since mesh isn't available we can't access it.
Try going to the mesh collider > Cooking options > deselect Fast Midphase option and run it again.
Warning error gives some hints on what to do to avoid this issue:
"default" mesh has over 2,097,152 triangles in it, and is using the Fast Midphase option. This might cause certain collisions to not be detected correctly due to an issue in the physics engine. If you observe that in your project, a workaround could be to turn off the Fast Midphase option for this particular mesh.