Link error on FSlateApplication::Get().GetPlatformApplication() ?

Development Programming & Scripting C++
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I see this code in other forum threads:

TSharedPtr<GenericApplication> app = FSlateApplication::Get().GetPlatformApplication();

But when I try and do this (on windows) I get a link error?

2>WindowActivation.cpp.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) protected: static class TSharedPtr<class GenericApplication,1> FSlateApplicationBase::PlatformApplication" (__imp_?PlatformApplication@FSlateApplicationBase@@1V?$TSharedPtr@VGenericApplication@@$00@@A) referenced in function "public: class TSharedPtr<class GenericApplication,1> __cdecl FSlateApplicationBase::GetPlatformApplication(void)" (?GetPlatformApplication@FSlateApplicationBase@@QEAA?AV?$TSharedPtr@VGenericApplication@@$00@@XZ)

is there some dependency that I have to add besides these?

PublicDependencyModuleNames.AddRange(new string[] {
    "Core", 
    "CoreUObject", 
    "Engine", 
    "InputCore",
    "InputDevice",
    "EnhancedInput",
    "ApplicationCore",
    "Slate",
});