Get URL

Hello guys I have created a button in flash, on that button I added on (release) {getURL("http://www.google.com","_blank");} but I get an error when running it.--------------------------------------------------------------------------Scene=Scene 1, Layer=Layer 4, Frame=37: Line 1: Mouse events are permitted only for button instances on (release) {------------------------------------------------------------------------- I don't get it I am putting the code on a button why is this happening any ideas?