When I build and run my project it seems that its lacking, plz help?!

In the unity 5 2d editor it works great, but when i build and run it it lacks some of the textures, for example: I can't go beyond my main menu because the "new game" and "quit game" tabs are missing. but in the editor it works fine!, plz help me. maybe I'm missing something obvious. what am I doing wrong?!