unresolved external symbol obwohl die OSH Lib eingebunden ist

static std::unique_ptr<OSHGui::Drawing::Renderer> renderer = std::make_unique<Direct3D9Renderer>(device);
 
renderer->BeginRendering();
 
auto buffer = renderer->CreateGeometryBuffer();
{
    Graphics g(*buffer);
    g.FillRectangle(Color::Red(), 9, 5, 300, 200);
    g.FillCircle(Color::Blue(), 9, 5, 200);
}
 
auto &renderTarget = renderer->GetDefaultRenderTarget();
renderTarget->Activate();
 
buffer->Draw();
 
renderTarget->Deactivate();
 
renderer->EndRendering();