Nexus s (from sdk ics to Asop ics)

I need a little help and I know this probably isn't the right forum for this but I've tried xda developers to no avail. I have the ics sdk port on my nexus s at the moment and was looking to flash the Asop version today which I did. But when I try to install I keep getting a (status 7) installation aborted message and it fails every time. Does anyone has any suggestions that might help me? I would appreciate all of them.