[4.3 Custom Editor Mode] Cannot Create My Own Mode Due to Linker Error FSlateIcon::FSlateIcon(void)

Dear Friends at Epic,

We are encouraged to create custom editor modes as follows:

/**
 *	Class responsible for maintaining a list of registered editor mode types.
 *
 *	Example usage:
 *
 *	Register your mode type with:
 *		FEditorModeRegistry::Get().RegisterMode<FMyEditorMode>( FName( TEXT("MyEditorMode") ) );
 *	or:
 *		class FMyEditorModeFactory : public IEditorModeFactory
 *		{
 *			virtual void OnSelectionChanged( FEditorModeTools& Tools, UObject* ItemUndergoingChange ) const override;
 *			virtual FEditorModeInfo GetModeInfo() const override;
 *			virtual TSharedRef<FEdMode> CreateMode() const override;
 *		};
 *		TSharedRef<FMyEditorModeFactory> Factory = MakeShareable( new FMyEditorModeFactory );
 *		FEditorModeRegistry::Get().RegisterMode( FName( TEXT("MyEditorMode") ), Factory );
 *
 *	Unregister your mode when it is no longer available like so (this will prompt the destruction of any existing modes of this type):
 *		FEditorModeRegistry::Get().UnregisterMode( FName( TEXT("MyEditorMode") ) );
 */

However I did that, and I get this compiler linker error!

UE4Editor-VictoryEdEngine.exp
1>VictoryEdEngine.cpp.obj : error LNK2019: unresolved external symbol “__declspec(dllimport) public: __cdecl FSlateIcon::FSlateIcon(void)” (_imp??0FSlateIcon@@QEAA@XZ) referenced in function "public: virtual struct FEditorModeInfo __cdecl FMyEditorModeFactory::GetModeInfo(void)const " (?GetModeInfo@FMyEditorModeFactory@@UEBA?AUFEditorModeInfo@@XZ)
1>C:\Users\Rama\Documents\Unreal Projects\Solus\Plugins\VictoryPlugin\Binaries\Win64\UE4Editor-VictoryEdEngine.dll : fatal error LNK1120: 1 unresolved externals

#Relevant Code

class FMyEditorModeFactory : public IEditorModeFactory
{	

		virtual FEditorModeInfo GetModeInfo() 	const override;

};

FEditorModeInfo FMyEditorModeFactory::GetModeInfo() 	const
{
	return FEditorModeInfo(FBuiltinEditorModes::EM_Physics, NSLOCTEXT("EditorModes", "Rama Vertex Snap Mode", "Rama Vertex Snap Mode"));
}

#How to Get Rid of Linker Error?

#Solution

Slate had to be included as a dependency in my Plugin :wink: (was not necessary in 4.2 so I was confused at first)

Rama