Acrobat Standard 9 : app.viewerVersion is throwing error.

Question

I'm using Acrobat 9 standard in Windows platform.
I have a vb 6.0 application and I have to find the version of
Acrobat installed on the user machine. I'm using the below code but it is throwing error :
Error Message:
Run-time error '-2147417851 (80010105)':
Automation error
The server threw an exception "
How can I find the version of Acrobat available in a
machine? The below code works with Acrobat 8.0
installed machine but fails with Acrobat 9.0 standard
Dim oAVDoc As Acrobat.CAcroAVDoc
Dim oPDDoc As Acrobat.CAcroPDDoc
Dim oJSO As Object
Dim iOK As Boolean
Private Sub Form_Load()
Set oAVDoc = CreateObject("AcroExch.AVDoc")
iOK = oAVDoc.Open ("<< required parameters>>")
Set oPDDoc = oAVDoc.GetPDDoc
Set oJSO = oPDDoc.GetJSObject
MsgBox (oJSO.App.viewerVersion)

Answer 1

I get much the same problem with VB6, Acrobat 9 Pro and WinXP SP3. When I single step the line:
oJSO.Collab.showAnnotToolsWhenNoCollab = True
in debug I go to the error handler for my Sub. Inspecting the VB Err object has Number = -2147417851 and Description = "Automation error
The server threw an exception." I get a Microsoft crash notice about Acrobat a short while later.
I've experimented with the JavaScript debugger in Acrobat and you can execute Collab.showAnnotToolsWhenNoCollab = True and reference the value of Collab.showAnnotToolsWhenNoCollab in the console. The problem appears only when accessing Acrobat Javascript through the Interapplication Communication API.
If anyone can help it would be appreciated. I tried Adobe's Acrobat support and they were no help at all.