Unable to call .GetJSObject in VBA (Acrobat DC Pro)

Hi,

I'm currently doing some coding task to export pdf files to doc ones. I tried to use batch sequence but Acrobat will eventually pop up error messages or just exist itself for some files. To get the things under control, I tried to use AIC (for excel VBA) to export them one by one, but met barrier for using jso.

I tested the basic AIC function by using the following code and it was working correctly :

Sub test()
    Dim AcroApp As Acrobat.CAcroApp
    Dim theDocument As Acrobat.CAcroPDDoc
    Dim bm As Acrobat.AcroPDBookmark
    Dim thePath As String
    thePath = "C:\temp\test.pdf"
'    Set AcroApp = CreateObject("AcroExch.App")
    Set theDocument = CreateObject("AcroExch.PDDoc")
    theDocument.Open (thePath)
    MsgBox "Number of pages: " & theDocument.GetNumPages
    theDocument.Close
'    AcroApp.Exit
    Set AcroApp = Nothing
    Set theDocument = Nothing
    Set bm = Nothing
    MsgBox "Done"
End Sub

But the following code will fail on line 9, error is "Object variable not set (Error 91)"

Sub test2()
    Dim gApp As AcroApp
    Dim gPDDoc As AcroPDDoc
    Dim jso As Object
    
    Set gApp = CreateObject("AcroExch.App")
    Set gPDDoc = CreateObject("AcroExch.PDDoc")
    If gPDDoc.Open("C:\temp\test.pdf") Then
        jso = gPDDoc.GetJSObject
        jso.SaveAs "/c/myDocs/myDoc.xlsx", "com.adobe.acrobat.xlsx"
    End If
End Sub

I have referenced the Type Library.

Please let me know if there are anything I can do / try to get the wheel rolling, thank you.

Kind Regards,

Winter