[Pharo-users] How do I debug: "There was an error while trying to install GitFileTree. Installation was cancelled." from Catalog Browser

Using a freshly downloaded Pharo5.0 and the Catalog Browser, I'm getting a Notification with the message in the subject line while installing GitFileTree, but I get a notification with no indication of why or what the error is ... how am I supposed to debug this? I mean I can guess what load expression is being used, but for a beginner, this is not a pleasant introduction ... There is no Pharo debug log either, so I will have to splash around and try to load GitFileTree, in the meantime... Dale