Error in maintainance plan : Exception has been thrown by the target of an invocation. (mscorlib)

Hi,

I am getting below error while trying to create new maintainance plan in SQL 2008 R2, by right click on "New Maintainance plan"...could you please help on this...

I have tried to register DTS.dll but after that also error is coming...

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Exception has been thrown by the target of an invocation. (mscorlib)

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Program Location:

   at System.RuntimeMethodHandle._InvokeMethodFast(Object target, Object[] arguments, SignatureStruct& sig, MethodAttributes methodAttributes, RuntimeTypeHandle typeOwner)
   at System.RuntimeMethodHandle.InvokeMethodFast(Object target, Object[] arguments, Signature sig, MethodAttributes methodAttributes, RuntimeTypeHandle typeOwner)
   at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture, Boolean skipVisibilityChecks)
   at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
   at Microsoft.SqlServer.Management.DatabaseMaintenance.MaintDesignerMenuHandler.GetExistingPackageNames(String serverName, String userName, SqlSecureString securePassword)
   at Microsoft.SqlServer.Management.DatabaseMaintenance.MaintDesignerMenuHandler.GetNewPackageName(String serverName, String userName, SqlSecureString securePassword)
   at Microsoft.SqlServer.Management.DatabaseMaintenance.MaintDesignerMenuHandler.Invoke()

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No description found

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Program Location:

   at Microsoft.SqlServer.Dts.Runtime.Application.GetPackageInfos(String strFolder, String serverName, String serverUserName, String serverPassword)