CMS act_as_tree problem and template_root

Hi,

I want use the comatose CMS plug in for creatin one application.
I installed all the things.
When I run this application I got this error.
"template_root".

Please clear my problem. And How can I create one application by using
the comatose. Please send the sample application if available.

Thank you,

srinivas rao.pala