unity3d - Changing color of of gameObject in Unity -

okay have code.

void start () {     gameobject.getcomponent<renderer> ().material.color = color.green; } 

i expected gameobject change color green. imported black , in inspector has turned green in actual application not appear green. cant use gameobject.renderer.material.color = color.green since unity tell me outdated , have use new version. going simple missing? in advance.

update: when run code tab pops in inspector 'sprites-default (instance)' , if change selection box unlit > color works. there anyway of making stick?

the color changes cant see result because shader in material needs light , don't have lights see black can add light source or change materials shader unlight.