Slate Widget fails to compile once added to a new project

Slate Widget fails to compile when you add it to a new project. Expected as a user that anything in that default list should be able to be added and compile fine without making any changes.

CompilerResultsLog: Info [1/2] Compile SMyCompoundWidget.cpp
CompilerResultsLog: Info In file included from /Users/Andrew.Porter/Documents/Unreal Projects/newCode/Source/newCode/SMyCompoundWidget.cpp:4:
CompilerResultsLog: Info ../../../../../Andrew.Porter/Documents/Unreal Projects/newCode/Source/newCode/SMyCompoundWidget.h:8:46: error: unknown class name 'SCompoundWidget'; did you mean 'SMyCompoundWidget'?
CompilerResultsLog: Info class NEWCODE_API SMyCompoundWidget : public SCompoundWidget
CompilerResultsLog: Info ^~~~~~~~~~~~~~~
CompilerResultsLog: Info SMyCompoundWidget
CompilerResultsLog: Info ../../../../../Andrew.Porter/Documents/Unreal Projects/newCode/Source/newCode/SMyCompoundWidget.h:8:19: note: 'SMyCompoundWidget' declared here
CompilerResultsLog: Info class NEWCODE_API SMyCompoundWidget : public SCompoundWidget
CompilerResultsLog: Info ^
CompilerResultsLog: Info ../../../../../Andrew.Porter/Documents/Unreal Projects/newCode/Source/newCode/SMyCompoundWidget.h:8:46: error: base class has incomplete type
CompilerResultsLog: Info class NEWCODE_API SMyCompoundWidget : public SCompoundWidget
CompilerResultsLog: Info ~~~~~~_^~~~~~~~~~~~~~
CompilerResultsLog: Info ../../../../../Andrew.Porter/Documents/Unreal Projects/newCode/Source/newCode/SMyCompoundWidget.h:8:19: note: definition of 'SMyCompoundWidget' is not complete until the closing '}'
CompilerResultsLog: Info class NEWCODE_API SMyCompoundWidget : public SCompoundWidget
CompilerResultsLog: Info ^
CompilerResultsLog: Info ../../../../../Andrew.Porter/Documents/Unreal Projects/newCode/Source/newCode/SMyCompoundWidget.h:11:2: error: unknown type name 'SLATE_BEGIN_ARGS'
CompilerResultsLog: Info SLATE_BEGIN_ARGS(SMyCompoundWidget)
CompilerResultsLog: Info ^
CompilerResultsLog: Info ../../../../../Andrew.Porter/Documents/Unreal Projects/newCode/Source/newCode/SMyCompoundWidget.h:12:4: error: expected ';' at end of declaration list
CompilerResultsLog: Info {}
CompilerResultsLog: Info ^
CompilerResultsLog: Info ;
CompilerResultsLog: Info /Users/Andrew.Porter/Documents/Unreal Projects/newCode/Source/newCode/SMyCompoundWidget.cpp:6:1: error: unknown type name 'BEGIN_SLATE_FUNCTION_BUILD_OPTIMIZATION'
CompilerResultsLog: Info BEGIN_SLATE_FUNCTION_BUILD_OPTIMIZATION
CompilerResultsLog: Info ^
CompilerResultsLog: Info /Users/Andrew.Porter/Documents/Unreal Projects/newCode/Source/newCode/SMyCompoundWidget.cpp:7:1: error: expected unqualified-id
CompilerResultsLog: Info void SMyCompoundWidget::Construct(const FArguments& InArgs)
CompilerResultsLog: Info ^
CompilerResultsLog: Info /Users/Andrew.Porter/Documents/Unreal Projects/newCode/Source/newCode/SMyCompoundWidget.cpp:16:1: error: unknown type name 'END_SLATE_FUNCTION_BUILD_OPTIMIZATION'
CompilerResultsLog: Info END_SLATE_FUNCTION_BUILD_OPTIMIZATION
CompilerResultsLog: Info ^
CompilerResultsLog: Info /Users/Andrew.Porter/Documents/Unreal Projects/newCode/Source/newCode/SMyCompoundWidget.cpp:16:38: error: expected unqualified-id
CompilerResultsLog: Info END_SLATE_FUNCTION_BUILD_OPTIMIZATION
CompilerResultsLog: Info ^
CompilerResultsLog: Info 8 errors generated.

1. Open UE4Editor.exe
2. Create a new code project
3. Once in editor, File > add code to project
4. Select Slate Widget at the bottom of the lest
5. Select Next then Create Class

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