[Radiant] undefined tag `search' sphinx-search extension

[Martin Silenus]

Hi guys. Could you help me with that issue. I get an "undefined tag
`search' " error on a Search page when I try to view it.
I've setted up page type to "Search" and followed instructions in this
screencast. 
http://radiantcms.org/blog/archives/2010/08/12/radiantcasts-episode-22-sphinx-search-extension/
.What i'm doing wrong? Thanks.