CR 8.5 type mismatch help!

I have some existing code that now fails after upgrading to CR 8.5 (these are old reports!). I know VB but next to nothing about CR. Any help is much appreciated. The offending code is below:

Dim Report As New CrystalReport1
Dim CommSub As SubreportObject

Option Explicit

Private Sub Form_Load()
Dim SQL As String
Dim SQL2 As String
Dim x As Integer

Screen.MousePointer = vbHourglass
-->Set CommSub = Report.Details<-- this FAILS!!!


Thanks

Jeff

Details is not a Subreport type. It is a section type

I should have posted the rest of the code:

Set CommSub = Report.Details
CommSub.OpenSubreport.Database.SetDataSource AdoSub.Recordset, 3, 1

Since Details is a section, how should the OpenSubreport function be handled? Are different versions of CR this unique?

Thanks!