Unable to Validate a Cluster Configuration. The operation has failed. The action validate a configuration did not complete .

Question

There is an error in XML document (5, 73).  
Attempt by method
Microsoft.Xml.Serialzation.GeneratedAssembly.XmlSerialzationReaderClusterPrep.Config.Read4_As...Bolean) to access method
MS.Internal.ServerClusters.Validation.TestAssemblyCollection.Add(MS.Internal.ServerClusters.V....Failed

Answer 1

Resolution:
1.) Copy the 2 Config Files attached to $PSHome (typically C:\Windows\System32\WindowsPowerShell\v1.0) – Done !
2.) Copy powershell.exe to PS.exe and create a config file
- cd $PSHome (which is the path where the powershell binaries live)
- copy powershell.exe PS.exe
- create a config file PS.exe.config with the content below
Now you have the possibility to open a “normal” PS 4.0 Window and run the following command: 
ps.exe –command “Test-Cluster –li”
You can run this command from a powershell script as well.
This way you don´t touch your existing PS4.0 environment and don´t need to do extra testing of all scripts, but can run the Test-Cluster cmd-let on the clusters as expected.
More information:
Powershell.exe.config will be read, if a Powershell Window is opened.
Powershell_ise.exe.config will be read if the „Integrated Scripting Environment“ Powershell_ise.exe is opened.
The Content of the Config Files is as follows and can be edited with notepad
<?xml
version="1.0"
encoding="utf-8" ?>
<configuration>
 <system.xml.serialization>
   <xmlSerializer
useLegacySerializerGeneration="true"/>
 </system.xml.serialization>
</configuration>
In the config file powershell is advised to execute the legacy serialization code as it has been done in Powershell 2.0.
If you set the value of the variable <xmlSerializer
useLegacySerializerGeneration="false"/>
to false,
powershell 4.0 would behave as if you would not have created a config file.