I followed the instructions in the Users guide provided with Mathematica-Root. (A Mathematica Importer for CERN ROOT Files -- from Wolfram Library Archive)
The first part was successful i.e. I was able to
I am not able to load the example.
Import["cernstaff.root",{"ROOT", "Keys"}]
Import::format: Cannot import data as ROOT. >>
I don’t know how to proceed from here. Help appreciated.