I had to look up the word "instantiate" and I've still got no idea what it means . My colleague has set up this survey. It's not active yet - but I'm sure I've emailed out inactive surveys before so that shouldn't be the problem.
This only appears when you click on the little email symbol in the "display tokens" area which lists your 'participants'. If you click the little green cog icon (and when it prompts you for the token, you enter it) there is no error. So it's just a MAIL issue I think..