Material cutout problem

Hello, im newbie. im learning with tutorials. i will try minimap tutorial

I made everything same but my version does not work

Offical version : Screenshot by Lightshot
play mode my version cutout : Screenshot by Lightshot
play mode my version opaque : Screenshot by Lightshot
Editing mode my version (prefab) : Screenshot by Lightshot
finish line : Screenshot by Lightshot ( everything ok without icon )
my project : https://drive.google.com/file/d/0B7evPTZKnq28N3g5MDV1LU1ldEk/view?usp=sharing

What is my mistake?

Thank you

oh i fixed, my color alpha 0, cutout needed 255