Trying to install DFS from command line/powershell:

the given key was not in the dictionary error

Install-WindowsFeature : The given key was not present in the dictionary.
At line:1 char:1
+ Install-WindowsFeature FS-DFS-Namespace, FS-DFS-Replication, RSAT-DFS ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : NotSpecified: (:) [Install-WindowsFeature], KeyNotFoundException
+ FullyQualifiedErrorId : System.Collections.Generic.KeyNotFoundException,Microsoft.Windows.ServerManager.Commands
.AddWindowsFeatureCommand


What does that mean?

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In this example our server had a faulty system disk and was in the process of self destruction.

There are posts that explain it is to do with group policy XMLs being corrupted and I thin that is which part of the disk was in dilapidation at the time.

We restored the server to another disk and the system recovered.

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