[reggoboy]

 The file browser itself is giving you that error

Yea, that's what I figured :-) 

But I just noticed something! "Not a directory" made me think that it thinks we have selected a File rather than a Directory, so I did some experimenting. If you look at that screen shot, the first file in the directory is highlighted. But when I navigate to another directory and then come back, there is NO LONGER any file highlighted (and then it succeeds). 

So it seems that the problem is that when the directory screen is first opened, a file is selected. If that could be prevented, the problem would probably go away. Maybe that will help!