PIR sensor trouble???

Just bought a PIR sensor from radioshack and plan to use it in a simple motion detection alarm. I downloaded the sketch radioshack has just to see how the PIR sensor would work and it verifies fine however, when I try to upload it I get this error message "avrdude: stk500_getsync(): not in sync: resp=0x00". Any ideas?

Silly me forgot to switch back to 2560 in the board selection after uploading to my uno... sorry all lol