run vi from vba without compiling gets error 13 type mismatch

Hi, 

I'm trying to use VBA code to access Agilent 33250A vi driver.  I follow examples in the forums  but I'm not quite sure why I'm getting 'Run Time error 13' type mismatch.

Sub LabVIEW()
Dim filepath As String
Dim lvapp As Application
Dim vi As VirtualInstrument
Dim ParamNames(0 To 1) As String
Dim ParamVal(0 To 1) As Variant

Set lvapp = CreateObject("LabVIEW.Application") 'create connection to labview
filepath = "C:\Program Files\National Instruments\LabVIEW 2013\instr.lib\Agilent 33XXX Series\Public\Action-Status\Enable Output.vi"
Set vi = lvapp.GetVIReference(filepath) 'load vi

ParamNames(0) = "VISA resource name"
ParamNames(1) = "Enable Output (T: Enable)"

ParamVal(0) = "GPIB0::10::INSTR"
ParamVal(1) = True

vi.FPWinOpen = True
vi.Call ParamNames, ParamVal

lvapp.Quit

End Sub

Any suggestions?

Thanks,