Perhaps it would be simpler to use the $( ) alternative to ` `, where 
there is less possibility for confusion over characters. As below:

	rosrun rviz rviz -d $(rospack find turtle_tf) /rviz/turtle_rviz.vcg

Regards,

Joel

Josh Faust wrote, On 21/07/10 23:00:
> You're using single quotes (same key as " on the keyboard), instead of
> backticks (Same key as ~).
>
> Josh
>
> On Wed, Jul 21, 2010 at 2:58 PM, Vinay K <vinay.csir@gmail.com
> <mailto:vinay.csir@gmail.com>> wrote:
>
>     HI,
>
>     While running any application with rviz using a vcg file, I get the
>     same error i.e. File [rospack find package_name] does not exist.
>     Below given is the following output..
>
>     vros@ubuntu:~$ rosrun rviz rviz -d 'rospack find turtle_tf'
>     /rviz/turtle_rviz.vcg
>     [ INFO] 1279749063.222485000: Loading general config from
>     [/home/vros/.rviz/config]
>     [ INFO] 1279749063.222872000: Loading display config from
>     [/home/vros/.rviz/display_config]
>     [ERROR] 1279749064.042076000: File [rospack find turtle_tf] does not
>     exist
>
>     What is the cause of this error?
>
>     Vinay
>
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-- 
Research Associate
Ocean Systems Laboratory
Heriot-Watt University, UK