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"They find that three main issues stand out. First, Reinhart and
Rogoff selectively exclude years of high debt and average growth.
Second, they use a debatable method to weight the countries. Third,
there also appears to be a coding error that excludes high-debt and
average-growth countries. All three bias in favor of their result, and
without them you don't get their controversial result."

http://www.nextnewdeal.net/rortybomb/researchers-finally-replicated-reinhart-rogoff-and-there-are-serious-problems#.UW147o4A23o.twitter

See also:
http://www.slate.com/blogs/moneybox/2013/04/16/reinhart_rogoff_coding_error_austerity_policies_founded_on_bad_coding.html

http://www.guardian.co.uk/commentisfree/2013/apr/16/unemployment-reinhart-rogoff-arithmetic-cause