Forefront Server Security Management Console

Hi,

When try add a server, the following error is come up: Anyone know what
causes it?

################################################## ###
Server Error in '/FSSMConsole' Application.
________________________________________
An item with the same key has already been added.
Description: An unhandled exception occurred during the execution of the
current web request. Please review the stack trace for more information
about the error and where it originated in the code.

Exception Details: System.ArgumentException: An item with the same key has
already been added.

Source Error:
An unhandled exception was generated during the execution of the current web
request. Information regarding the origin and location of the exception can
be identified using the exception stack trace below.

Stack Trace:
[ArgumentException: An item with the same key has already been added.]
System.Runtime.Remoting.Proxies.RealProxy.HandleRe turnMessage(IMessage
reqMsg, IMessage retMsg) +7596735
System.Runtime.Remoting.Proxies.RealProxy.PrivateI nvoke(MessageData&
msgData, Int32 type) +275
Microsoft.FFSMC.Services.UserManagement.GetCluster Types(String queryStr,
Dictionary`2& serverClusterTypeDict) +0
Microsoft.SEM.Services.LocalUserManagement.GetClus terTypes(String
queryStr, Dictionary`2& serverClusterTypeDict) +68
Microsoft.SEM.SEMConsole.ServerManagementAddMachin e.InsertNewMachines(String&
errorMachines, Boolean& bContinue) +216
Microsoft.SEM.SEMConsole.ServerManagementAddMachin e.InsertMachines_Click(Object
sender, EventArgs e) +143
System.Web.UI.WebControls.Button.OnClick(EventArgs e) +111
System.Web.UI.WebControls.Button.RaisePostBackEven t(String eventArgument)
+110
System.Web.UI.WebControls.Button.System.Web.UI.IPo stBackEventHandler.RaisePostBackEvent(String
eventArgument) +10
System.Web.UI.Page.RaisePostBackEvent(IPostBackEve ntHandler
sourceControl, String eventArgument) +13
System.Web.UI.Page.RaisePostBackEvent(NameValueCol lection postData) +175
System.Web.UI.Page.ProcessRequestMain(Boolean
includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1565

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Version Information: Microsoft .NET Framework Version:2.0.50727.3082;
ASP.NET Version:2.0.50727.3082