NM: Migrations stuck in Pending, with "error Root element is missing" error in worker event log (4311986)

Issue

Test Migrations work from the Master Migration Control Center, but the migrations are stuck in "Pending" status on the migration worker. There's no error in the log.

The migration workstation Event Log shows an error:  "CMT Migration Worker: ParseResultsAndUpload: error Root element is missing"

How can we resolve?

Solution

There are two possible solutions

1. If this happens on all workers, then there is an IIS permissions issue on the Migration Control Center(Master).
   Open IIS properties, go to Directory Security
   In the Enable anonymous access section, specify the credential of the The ASP.NET user and the IUSR_<computername> user can be added to local admins
   Once this is configured, restart the machine, and the migration workers
2. If this is only occurring on one migration worker, then it's possible the PC setup is corrupt. 
   Completely uninstall the CMTe worker application, reboot, and reinstall the worker software, register the worker, and test the migration again.
   If this still fails then the machine is corrupt.
   If this is a virtual machine, then rebuild the image.  If this is a physical machine, it should be rebuilt, or replaced.