LabWindows/CVI

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Calling a labview vi in visual basic

hi i have called the labview as below:

 

Private Sub mnuNIForm_Click()

Dim lvapp As LabVIEW.Application
Dim viPath As Object
Dim vi As LabVIEW.VirtualInstrument
Dim paramNames(4), paramVals(4)

Set lvapp = CreateObject("LabVIEW.Application")
viPath = lvapp.ApplicationDirectory + "\New Folder\WaterLogPage.vi"

Set vi = lvapp.GetVIReference(viPath)   'Load the vi into memory
vi.FPWinOpen = True                     'Open front panel

 

 

this 2 lines shows some error

viPath = lvapp.ApplicationDirectory + "\New Folder\WaterLogPage.vi"

Set vi = lvapp.GetVIReference(viPath)   'Load the vi into memory

 

the error is :

run-time error '91';

Object variable or with block variable not set

 

i dont know wat is the wrong thr i just use the example for the forum..plz help me to solve this..

 

 

 

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