No IndiRank - "problem detecting your feed"

Hi, could someone help me how to get over this problem of not getting an Indirank in Apr 2016, all of a sudden, please?

All the IndiRank Stats checker says is: "There was a problem detecting your feed."

But when I check my feed (http://happyproject.in/feed) on http://www.feedvalidator.org, they say it is a valid feed.

I'm baffled! Somebody help, please. (BTW, a mail to Indiblogger just got me an automated response so far, in about a week).