Maybe you need put in 0 (zero) hours. I have done computer programming so I know how illogically they can be. Many years ago a guy kept getting an electric bill for $0.00, they threated to cut off his power unless he paid $0.00. He finally wrote a check for $0.00 and it fixed the bill problem but then it blew up at the bank because they could not clear a check for $0.00.