flashing red program status LED

On downloading code, everything seems to be going smoothly untill I try pushing a button on the controller. The robot, hooked up to 4 motors, then spazes quickly at about 5 second intervals and the front LED, labeled “PGRM STATUS,” then flashes red thrice, pauses, then repeats. Any thoughts?

Reload the master code and then re-download your program.

Thanks. It works now.