"Requires a file name" error

I am using this code to allow the user to import a file into access:

Function TestIt3()
    Dim strFilter As String
    Dim strInputFileName As String
    strFilter = ahtAddFilterItem(strFilter, "CSV Files (*.csv)", "*.CSV")
    strFilter = ahtAddFilterItem(strFilter, "All Files (*.*)", "*.*")
        strInputFileName = ahtCommonFileOpenSave( _
                Filter:=strFilter, OpenFile:=True, _
                DialogTitle:="Please select an import file...", _
                Flags:=ahtOFN_HIDEREADONLY)
        MsgBox "You selected: " & strInputFileName, (vbInformation), "Walklist Selection"
    Debug.Print Hex(IngFlags)
    Debug.Print strInputFileName
    DoCmd.TransferText acImportDelim, "Parameter Spec", "WalklistTemplate", strInputFileName, hasfieldnames - 1
End Function

It works perfectly, except for when you press the cancel button in the browse file dialog box.  Then it comes up with the error, "The action or method requires a file name argument."
This is because the DoCmd.TransferText action is looking for a file name, but because the user pressed cancel, it comes up with an error.  
Is there any way I can just make the cancel button work without coming up with an error message?

Thanks!