Open UEditorWidgetBlueprint from toolbar button compiler error

Development Pipeline & Plugins Plugins
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1

Hi, when I am creating a new plugin with the toolbar button template and trying to just link UEditorUtilityWidgetBlueprint I do get the following error on the Cast line:

unresolved external symbol "private: static class UClass * __cdecl UEditorUtilityWidgetBlueprint::GetPrivateStaticClass(void)" (?GetPrivateStaticClass@UEditorUtilityWidgetBlueprint@@CAPEAVUClass@@XZ) referenced in function "public: void __cdecl FChromaButtonsModule::OpenWidget(void)" (?OpenWidget@FChromaButtonsModule@@QEAAXXZ)

Build.cs:

PublicDependencyModuleNames.AddRange(
			new string[]
			{
				"Core",	
			
				// ... add other public dependencies that you statically link with here ...
			}
			);
			
		
		PrivateDependencyModuleNames.AddRange(
			new string[]
			{
				"Projects",
				"InputCore",
				"UnrealEd",
				"ToolMenus",
				"CoreUObject",
				"Engine",
				"Slate",
				"SlateCore",
				"UMG",
				"UMGEditor",
				"Blutility",
			
				// ... add private dependencies that you statically link with here ...	
			}
			);

Code (In Plugins main class):

void FChromaButtonsModule::PluginButtonClicked()
{
	UE_LOG(LogTemp, Warning, TEXT("OpenWidget"));
	FString assetPath = TEXT("EditorUtilityWidgetBlueprint'/Game/TestWidgetFolder/MyTestWidgetBlueprint.MyTestWidgetBlueprint'");
	FSoftObjectPath tmpPath = FSoftObjectPath(assetPath);
	auto loadedAsset = tmpPath.TryLoad();

	if (UWidgetBlueprint* Blueprint = Cast<UWidgetBlueprint>(loadedAsset))
	{
		if (Blueprint->GeneratedClass->IsChildOf(UEditorUtilityWidget::StaticClass()))
		{
			//the following line gives me a headache
			UEditorUtilityWidgetBlueprint* EditorWidget = Cast<UEditorUtilityWidgetBlueprint>(Blueprint);
			/*... do things here ... */
		}
	}
}
/*

This is the same code snippet as used in the engines code:
https://github.com/EpicGames/UnrealEngine/blob/d94b38ae3446da52224bedd2568c078f828b4039/Engine/Source/Editor/Blutility/Private/AssetTypeActions_EditorUtilityWidgetBlueprint.cpp#L121

What am I missing here

Thanks in advance