What is null?

Click "Go Back" on the installation window and click "Continue" again. You should then be able to select your hard drive.
 
Null means Nothing, so there's no reason (null), but you didn't show the entire window, just the message, does it let you go back, and then continue? You should also try restarting. Did you download the newest update for Aquamon? You also may need to disable your haxies to get this to work (what's making the drive space indication on your harddrive icon?)
(edit) follow with Bobw, that should work.
 
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