Object Variable Not Set Problem

Dear All:

Code:

Private Sub Command167_Click()
On Error GoTo Err_Command167_Click
Dim objWordApp As Object
Dim objWordDoc As Object
Set oApp = CreateObject("Word.Application")
'make word not show up to user
objWordApp.Visible = False
Set objWordDoc = objWordApp.Documents.Open("C:Documents and SettingsUserDesktopEXPRESS DIPLOMA LETTER.doc")
objWordDoc.PrintOut
'quits word
objWordApp.Quit
Set objWordDoc = Nothing
Set objWordApp = Nothing
Exit_Command167_Click:
Exit Sub
Err_Command167_Click:
MsgBox Err.Description
Resume Exit_Command167_Click

End Sub

When a command button is pressed, it returns: "OBJECT VARIABLE OR WITH vARIABLE NOT SET"

Does anyone have an idea on how to solve this problem?

Many thanks in advance.

Dion