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Exchange Management Console in Exchange 2010 fails

The EMC is failing to work.  I have tried opening it directly and through MMC.  I get the following message when I try to load it.

 at System.RuntimeTypeHandle.CreateInstance(RuntimeType type, Boolean publicOnly, Boolean noCheck, Boolean& canBeCached, RuntimeMethodHandle& ctor, Boolean& bNeedSecurityCheck)
   at System.RuntimeType.CreateInstanceSlow(Boolean publicOnly, Boolean fillCache)
   at System.RuntimeType.CreateInstanceImpl(Boolean publicOnly, Boolean skipVisibilityChecks, Boolean fillCache)
   at System.Activator.CreateInstance(Type type, Boolean nonPublic)
   at System.RuntimeType.CreateInstanceImpl(BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes)
   at System.Activator.CreateInstance(String assemblyName, String typeName, Boolean ignoreCase, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes, Evidence securityInfo, StackCrawlMark& stackMark)
   at System.Activator.CreateInstance(String assemblyName, String typeName)
   at System.AppDomain.CreateInstanceAndUnwrap(String assemblyName, String typeName)
   at Microsoft.ManagementConsole.Internal.SnapInClient.CreateSnapIn(String assemblyName, String typeName)
   at Microsoft.ManagementConsole.Internal.ClassLibraryServices.Microsoft.ManagementConsole.Internal.IClassLibraryServices.CreateSnapIn(String assemblyName, String typeName)
   at Microsoft.ManagementConsole.Executive.SnapInInitializationOperation.OnStart()
   at Microsoft.ManagementConsole.Executive.RunningOperationsTable.EnqueueOperation(Operation operation)
   at Microsoft.ManagementConsole.Executive.StandAloneComponentData..ctor(SnapInRegistrationInfo info, Int32 bookkeepingId)
   at Microsoft.ManagementConsole.Advanced.FrameworkSnapInFactory.Microsoft.ManagementConsole.Advanced.ISnapInFactory.CreateSnapIn(Int32 bookkeepingId, String snapInKey, Object& snapIn)
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Is it the only snap-in that failes when you add it to MMC?
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All the other snap-in's that I use work fine
Is there more info in the application event log?
Not that I could find.  Should I be looking for something specific (source or Task Category)
The error is to basic. It could be a lot of things.
Did you recently install updates? Or did you install some 3rd party app?
No.  Is there a way to reinstall it?
Do you receive an error when you start EMS (shell) from a command prompt by running the cmdlet C:\Program Files\Microsoft\Exchange Server\bin\exshell.psc1 ?
runs fine.
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Yes I can.  That works perfectly.