OpenStudio 2.0 doesn't ship with the standard reporting measure as it did in 1.x Instead at the first launch it downloads it from BCL. @hchitrakar make sure you have internet access and try again. May also try it in PAT. 2.x as well. There could have also been a brief BCL outdate at the time.

The advantage of this approach, when it works, is getting access to reporting measure updates between major releases.