ARDOUR DO NOT OPEN AND OLD SESSION

I saved a session a couple of months ago, I was trying to open it and I got this message: “Snapshot did not load successfully”.
What can I do to open it?
Mac OSX 10.5.8

@guitarwaves: this could be caused by quite a few different things. We generally prefer not to try to debug this sort of thing on the forums - its too slow and much too inefficient for us. So come find us on IRC (#ardour-osx channel, see http://ardour.org/support for information on IRC). Meanwhile, open the Console (Applications -> Utilities -> Console) and collect any output from Ardour there as you try to load the session.