unable to open dispaly error from vncviewer

[PARESH MASANI]

Hi,
When i tried to connect my existing session from unix side vncviewer. It
has shown following error message and vncviewer didnt start. Could anyone help
me on this.
 
VNC Viewer Free Edition 4.1.2 for X - built Sep 26 2007 23:49:43
Copyright (C) 2002-2005 RealVNC Ltd.
See http://www.realvnc.com for
information on VNC.
vncviewer: unable to open display ""

Thanks,
Paresh
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