VMM service does not start and returns ReflectionTypeLoadException after you apply an update rollup

S’applique à : Microsoft System Center 2012 R2 Virtual Machine ManagerSystem Center 2012 Virtual Machine Manager


After you apply an update rollup for System Center 2012 R2 Virtual Machine Manager (VMM 2012), the System Center Virtual Machine Manager service may not start as expected. When you try to manually start the service, you receive the following pop-up message: 

The System Center Virtual Machine Manager service local computer started and then stopped. Some services stop automatically if they are not in use by other services or programs. 

In this situation, the VirtualMachineManager\Server\Operational log may contain an event that resembles the following:
Log Name: Microsoft-VirtualMachineManager-Server/Operational
Source: Microsoft-VirtualMachineManager-Server
Event ID:5004
Task Category: None
Level: Critical
Keywords: (2)
User: CONTOSO\VMMServiceAccount
Computer: VMM2012R2.contoso.com
VMM encountered a critical failure and will terminate the process. Check C:\ProgramData\VMMLogs\SCVMM.fcae9dc7-0779-4dce-b873-8ac20370c6fb\report.txt for a detailed report.

Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
<Data Name="ReportPath">C:\ProgramData\VMMLogs\SCVMM.fcae9dc7-0779-4dce-b873-8ac20370c6fb\report.txt</Data>
<Data Name="ExceptionToString">System.Reflection.ReflectionTypeLoadException: Unable to load one or more of the requested types. Retrieve the LoaderExceptions property for more information.
at System.Reflection.RuntimeModule.GetTypes(RuntimeModule module)
at System.Reflection.RuntimeModule.GetTypes()
at System.Reflection.Assembly.GetTypes()
at Microsoft.VirtualManager.Remoting.IndigoSerializableObject.BuildKnownAssemblyTypes(Assembly assembly)
at Microsoft.VirtualManager.Remoting.IndigoSerializableObject.InitializeKnownTypesCache(List`1 assembliesToExamine)
at Microsoft.VirtualManager.Engine.Remoting.IndigoServiceHost.InitializeKnownTypesCache()
at Microsoft.VirtualManager.Engine.VirtualManagerService.TimeStartupMethod(String description, TimedStartupMethod methodToTime)
at Microsoft.VirtualManager.Engine.VirtualManagerService.OnStart(String[] args)</Data>
<Data Name="Operation">


Update rollups for VMM may consist of more than one update package. In the most common scenario, an update is released for the VMM server and another is to be installed wherever the VMM console is installed. When server and console components are updated, interdependencies require both to be installed on the VMM server, with the VMM Server fix being installed first. In the scenario that's described in the "Symptoms" section, only the VMM console update has been applied to the VMM server.


To resolve this issue, complete the update rollup installation by installing the VMM server update package in addition to the console update. Both the VMM server and VMM Admin Console updates must be at compatible version levels. This will typically be the same update rollup level. For example, a VMM Admin Console should be at the VMM UR5 level if the server is also at UR5.  

In some instances, there may not be a comparable update for a component. In that case, the component should be updated to the most recent applicable update. For example, if the VMM server is updated to a post-UR5 hotfix, but there is no corresponding hotfix for the VMM Admin Console, the VMM Admin Console should be updated to UR5.

More Information

Frequently, server updates are deployed manually or through Windows Server Update Services (WSUS). For example, if one component is approved for installation and the other is not approved for deployment, you may experience the issues that are described in the "Symptoms" section. Also be aware that an update rollup package may be classified as either a security update or an update rollup.

For example, UR5 updates are provided on the Microsoft update catalog center server with the following labels: 
For the latest information about Update Rollup 5, see Description of the security update for Update Rollup 5 for System Center 2012 R2 Virtual Machine Manager