Object does not show

Hi,

When I replace the Andy object with a cube to test it works. The I tested 2 cubes, larger in size, in an empty gameobject as prefab and it worked. But when I added a player and a path (empty game objects connected via a script) for the player to follow, all in one empty gameobject made a prefab out of it and this doesn't show on the plane when I tap the screen.

I went back to the previous prefab with the 2 larger cubes and that doesn't work either anymore. Only one single cube works or the Andy prefab.

Don't know why, can someone help me with this?

Thank you
Cynthia