Gui Not Declared Button Help

[codergirl]

hi so I'm trying to add a button into my program and what it does is when I try running it is it says "GUI and ProcessEvent has not been declared"
when I take out the button from my program and run it by itself, it works fine...... what am I doing wrong?? Also, my program's a platform game where when it clicks the button, I want it to start the game

Turing:

import GUI procedure hello locate(1,1) put "clicked Button #1!" end hello procedure hi locate(1,1) put "clicked Button #2!!" end hi var button1:int:=GUI.CreateButton(25,25,0,"Button 1",hello) var button2:int:=GUI.CreateButton(25,50,0,"button 2",hi) loop exit when GUI.ProcessEvent end loop