Directdraw7 problem

I'm writing a small program using DirectDraw7 using Dev-C++. It all seems to be correct, but it throws up this

Code:

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173 C:\Documents and Settings\administrator\My Documents\Projects\Ultima Online\main.cpp
no matching function for call to `IDirectDraw::CreateSurface(

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when i try to compile.

here is the declaration:

Code:

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LPDIRECTDRAW lpDD;

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and here is the offending line

Code:

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ddrval = lpDD->CreateSurface( &ddsd, &DDSPrimary, NULL );

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any thoughts?