Through a Microsoft.Office.Interop.Word.Application object, i want to execute the “InkHighlighter” mso after i opened a document, but if i try to execute it, i get the following error:

“System.Runtime.InteropServices.COMException: ‘Error HRESULT E_FAIL has been returned from a call to a COM component.'”

I checked the GetEnabledMso and GetVisibleMso methods, the latter returned with a false value, I think that’s why the problem occurs

        var isInkHighlighterMsoEnabled = _app.CommandBars.GetEnabledMso("InkHighlighter");

        var isInkHighlighterMsoVisible = _app.CommandBars.GetVisibleMso("InkHighlighter");

        _app.CommandBars.ExecuteMso("InkHighlighter");

Any idea how i can execute the InkHighlighter code-behind?

(Btw the above code works well with “InkEraser”)