VB+Crystal report - ms-access

Question

I wrote this code but I got "Run time error '91':"
Private Sub Command1_Click()
Set rs = New ADODB.Recordset
openConnection
If Me.cmbMonth = "" And Me.cmbYear = "" Then
MsgBox "Please select MONTH and YEAR"
Exit Sub
End If
With crystalrpt
.ReportFileName = App.Path & "\Report\VariableReport.rpt" <-- ERROR IS HERE
.SelectionFormula = "{SW.dtaMonth}='" & cmbMonth.Text & "' and {SW.dtaYear}=" & dtaYear.Text & "" & _
" and {SFW.dtaMonth}='" & cmbMonth.Text & "' and {SFW.dtaYear}=" & dtaYear.Text & "" & _
" and {OT.dtaMonth}='" & cmbMonth.Text & "' and {OT.dtaYear}=" & dtaYear.Text & "" & _
" and {CL.dtaMonth}='" & cmbMonth.Text & "' and {CL.dtaYear}=" & dtaYear.Text & "" & _
" and {RM.dtaMonth}='" & cmbMonth.Text & "' and {RM.dtaYear}=" & dtaYear.Text & "" & _
" and {EL.dtaMonth}='" & cmbMonth.Text & "' and {EL.dtaYear}=" & dtaYear.Text & "" & _
" and {TRANS.dtaMonth}='" & cmbMonth.Text & "' and {TRANS.dtaYear}=" & dtaYear.Text & "" & _
" and {WD.dtaMonth}='" & cmbMonth.Text & "' and {WD.dtaYear}=" & dtaYear.Text & "" & _
" and {MP.dtaMonth}='" & cmbMonth.Text & "' and {MP.dtaYear}=" & dtaYear.Text & "" & _
" and {NONSTOCK.dtaMonth}='" & cmbMonth.Text & "' and {NONSTOCK.dtaYear}=" & dtaYear.Text & "" & _
" and {PACK.dtaMonth}='" & cmbMonth.Text & "' and {PACK.dtaYear}=" & dtaYear.Text & ""
.WindowTitle = "Report"
.Action = 1 'Will Show The Report
End With
End Sub

Answer 1

It's possible that you are trying to create an instance of a class (an object) from a class that is present on the machines you tested it on, but not on the machine it's been deployed to..... for example, I happen to know that I can make a VB program utilize a class for Nero Burning Rom.... I can make a nero object, and use it's methods and properties...... but that will only work on machines that have the Nero libraries installed. If it's not installed, when you try to make the object (either through early or late bindings with new or createobject), the variable that SHOULD refer to the object is still set to Nothing, because the library failed to create an instance of the requested class.....