Index was out of range. Must be non-negative and less than the size of the collection. rds server 2012 r2 setup

while setting up RDS in windows 2012 R2, I got below error
"Index was out of range. Must be non-negative and less than the size of the collection."


I have noticed, I have logged in as domain admin, not sure why that was behaving like that.
when I added another account and added that account as local admin and then all ok.


hope this will help someone.


Regards,
yes.sudhanshu