Create a missing program implementation
    When you create a program, it contains the forward declaration and the implementation.
            The forward declaration contains the 
extern
 keyword, such as
                extern program myProgram()[];
. If the forward declaration is specified but the implementation does not exist, you
            receive the error 
Missing implementation for external program ProgramName.
                Add a valid implementation. Error code: DS0171.
 You must create the
            missing program implementation file to resolve this error.To create a missing program implementation
- Open the Code Editor from the program element by right clicking the element and selectingCode Editor.
- In the Code Editor, navigate to the line number and Character column where you want to create the missing program implementation.
- Select to the left of the component with the missing implementation to open
                    the Code Actions menu. to the left of the component with the missing implementation to open
                    the Code Actions menu.
- SelectCreate missing program implementation.
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