Object Turning Grey after applying Material

Hello,
I’ve ran into a problem where if I create a material and apply it to an object the entire object turns gray instead of tiling the texture the material contains. This only occurs if I try to add the material onto a blender object. Maybe this is a common error and someone could offer a frequently made error list. Thank you~

If anyone ever runs into this problem. You are rendering the blender object without UV maps which are used for rendering textures on top of the game objects.