SQL SSIS problem - Unable to cast Com object

I often get this error message on a simple step in my SSIS package - what does it mean and how can I solve it?

Unable to cast COM object of type 'System.__ComObject' to interface type 'Microsoft.SqlServer.Dts.Runtime.IObjectWithSite'. This operation failed because the QueryInterface call on the COM component for the interface with IID '{FC4801A3-2BA9-11CF-A229-00AA003D7352}' failed due to the following error: The application called an interface that was marshalled for a different thread. (Exception from HRESULT: 0x8001010E (RPC_E_WRONG_THREAD)). (Microsoft Visual Studio)

Program Location:

Server stack trace:
   at Microsoft.SqlServer.Dts.Runtime.ComponentImpl.get_Site()
   at Microsoft.SqlServer.Dts.Runtime.DtsContainer.get_Site()
   at Microsoft.DataTransformationServices.Design.Undo.ComponentObjectId.GetObjectId(IComponent component)
   at Microsoft.SqlServer.IntegrationServices.Designer.Undo.PipelineSnapshot.GetSnapshotHelper(Object obj)
   at System.Runtime.Remoting.Messaging.StackBuilderSink._PrivateProcessMessage(IntPtr md, Object[] args, Object server, Object[]& outArgs)
   at System.Runtime.Remoting.Messaging.StackBuilderSink.AsyncProcessMessage(IMessage msg, IMessageSink replySink)

Exception rethrown at [0]:
   at System.Runtime.Remoting.Proxies.RealProxy.EndInvokeHelper(Message reqMsg, Boolean bProxyCase)
   at System.Runtime.Remoting.Proxies.RemotingProxy.Invoke(Object NotUsed, MessageData& msgData)
   at System.Func`2.EndInvoke(IAsyncResult result)
   at Microsoft.DataTransformationServices.Design.DesignUtils.RunOnMtaThreadFunc[TArg1,TResult](Func`2 function, TArg1 arg1)
   at Microsoft.SqlServer.IntegrationServices.Designer.Undo.PipelineSnapshot.GetSnapshot(Object obj)
   at Microsoft.DataTransformationServices.Design.Undo.UndoController.GetFullSnapshot(Object obj)
   at Microsoft.DataTransformationServices.Design.Undo.UndoController.GetSnapshot(Object component, MemberDescriptor memberDescriptor)
   at Microsoft.DataTransformationServices.Design.Undo.UndoController.ObjectSnapshotManager.TrySaveSnapshot(MemberDescriptor memberDescriptor)
   at Microsoft.DataTransformationServices.Design.Undo.UndoController.SnapshotManager.TrySaveSnapshot(Object obj, MemberDescriptor memberDescriptor)
   at Microsoft.DataTransformationServices.Design.Undo.UndoController.OnComponentChanging(Object sender, ComponentChangingEventArgs e)
   at System.ComponentModel.Design.ComponentChangingEventHandler.Invoke(Object sender, ComponentChangingEventArgs e)
   at System.ComponentModel.Design.DesignerHost.System.ComponentModel.Design.IComponentChangeService.OnComponentChanging(Object component, MemberDescriptor member)
   at Microsoft.DataTransformationServices.Design.DtsComponentDesigner.StartComponentUI(Boolean startGenericUI)
Chris MichalczukConsultantAsked:
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Vikas GargAssociate Principal EngineerCommented:
To fix the problem do the following:

1.       Open the command prompt

2.       Navigate to C:\Program Files\Microsoft SQL Server\90\DTS\Binn

3.       Run C:\Program Files\Microsoft SQL Server\90\DTS\Binn>regsvr32 dts.dll

That should fix the problem.

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