Initiated a phone conference with network group staff - Syed Zahur. He confirmed that "gmiller" profile is nowhere to be found under \\DMVSTG\userfiles\. User stated that she got this error message ever since she was relocated to Long Island from Queens.
If \\DMVSTG\userfiles\gmiller is still a valid map to the user, please created gmiller account under \\DMVSTG\userfiles\; If the user is no longer need this mapping, please update her login script to reflect this. Either way, I am referring this ticket to UAM group to do further determination.