An iOS Enterprise Distribution Issue

I'm writing this because when trying to export an iOS application for enterprise distribution I was noticing something weird: in the Xcode organiser it would list the app under "Other" rather than "iOS Apps" and it wouldn't show the icon.

If I tried to export the IPA then I got this message:

Missing Bundle Version Property in Distribution Manifest

Searching for this exact phrase online I found zero results, hence I'm writing this to save other people some potential bother. All you need to do is go to your Project Settings, choose the General tab and put a value in the Version field.

Yes this should have been obvious to me I guess, but maybe a message on build would have helped, though saying that the way Xcode handles build errors is far less than useful.