When attempting to run the verification script, you get this EXACT error message:
Error: java.io.IOException: R VM exited with exit code: 1, output: starting script  TRUE $fileName  NA $start  0 $length  0
If the word 'output' is part of the above error the usual cause is that the Hadoop output directory does not have the proper file permissions(rwx).
Make sure that the Hadoop output directory you are using, e.g. '/user/RevoShare/<yourlogin>' has full read-write AND execute permissions.