Error in generating the hexgird

In my first game in unity, I ma trying to build a hex gird first following this tutorial Generating the Grid . Using the second approach when I enter test mode, I can only see a rectangular line like the edge of my hexTile and not the grid. I attached the script to MainCamera as suggested in the tutorial. Then created an empty object named "Hexagon" and pasted the hexTile on it and attached a Mesh Renderer to it. Second, I created a Plane and then set these Hexagon and Plane to Hex and Ground fields in the Inspector. Please can anybody help me out what am I doing wrong? Thank you.