Error MIDL2009:Undefined Symbol:

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MFC

Hi,
I have created two IDispatch interfaces in my .idl file. namely IWksLayer and IWksItem simillarly I have created their dispinterface _DWksLayer and _DWksItem. I have done the forward declaration of these interfaces in idl file as below:

dispinterface   _DWksItem;
dispinterface   _DWksLayer;

interface       IWksItem;
interface       IWksLayer;

and have same declaration in Library section of .idl file. I am using parameter of type _DWksItem in one of the method of _DWksLayer as below:

[id(14)] _DWksItem* GetItem(long ItemID);

while compiling above line in idl file I am getting following error.

error MIDL2009: undefined symbol : _DWksItem [ Dispinterface '_DWksLayer' ]

Please let me know if anybody konws about the fix for this error.

Thanks