missing method on Microsoft.VirtualManager.Utils.AppSettings after updating Update Rollup 6 for System Center 2012 R2 Virtual Machine Manager

Hello.I'm using powershell via c# in order to create VMs etc...After upgrading to the latest version every time i try to run my usual code i get.Any ideas please???

w3wp.exe Error: 0 : [5/6/2015 1:54:15 PM] ERROR: 'xxx' GetExternalSwitches
System.Management.Automation.CmdletInvocationException: Method not found: 'Boolean Microsoft.VirtualManager.Utils.AppSettings.get_EnableBackwardCompatibleSerialization()'. ---> System.MissingMethodException: Method not found: 'Boolean Microsoft.VirtualManager.Utils.AppSettings.get_EnableBackwardCompatibleSerialization()'.
   at Microsoft.SystemCenter.VirtualMachineManager.Remoting.ServerConnection.CreateConnection()
   at Microsoft.SystemCenter.VirtualMachineManager.Remoting.ServerConnection.Initialize()
   at Microsoft.SystemCenter.VirtualMachineManager.Remoting.ServerConnection..ctor(String name, Nullable`1 port, Nullable`1 connectAs, String userRoleName, SecureCredential auditUserCredentialObject, InitializationStrategy initializationStrategy, Boolean useStrongReferences, Boolean retainDeletedObjects, Boolean jobsUseWeakReferences, Boolean forOnBehalfOf, Nullable`1 maxBufferPoolSize)
   at Microsoft.SystemCenter.VirtualMachineManager.Cmdlets.ConnectServerCmdlet.Process()
   at Microsoft.SystemCenter.VirtualMachineManager.Cmdlets.CmdletBase.ProcessRecord()
   at System.Management.Automation.CommandProcessor.ProcessRecord()
   --- End of inner exception stack trace ---
   at System.Management.Automation.Runspaces.PipelineBase.Invoke(IEnumerable input)
   ....Microsoft.VirtualManager.Utils.AppSettings