I can't seem to open an Autocad drawing in VBA. i keep getting a Collection not available in MDI mode error. Use documents. Here's the code I'm trying to run.

VB Code:
  1. Set acad = CreateObject("Autocad.Application")

  2.     Set acad = GetObject(, "AutoCAD.Application")

  3.     acad.Visible = False

  4.     

  5. 'Hide the dialogue box

  6.     Set acaDoc = acad.ActiveDocument

  7.     acaDoc.Open "C:\Projects\W7ls0116.dwg"

  8.     Set pViewport = acaDoc.ActiveViewport

  9.     pViewport.ZoomExtents

  10.     Set sset = acaDoc.SelectionSets.Add("NEWSS")

  11.     sset.Select acSelectionSetAll Set acad = CreateObject