Selector problem

[SeungwookJung]

I have selector problem. I want to select transform by client type, but I met following error UnnamedSelector: ComponentSelector could not find the component for hint: browser org.apache.avalon.framework.component.ComponentException: UnnamedSelector: ComponentSelector could not find the component for hint: browser   My sitemap is following     <map:selectors default="browser">    <map:selector name="browser" src="org.apache.cocoon.selection.BrowserSelectorFactory">     <!-- # NOTE: The appearance indicates the search order. This is very important since          #       some words may be found in more than one browser description. (MSIE is          #       presented as "Mozilla/4.0 (Compatible; MSIE 4.01; ...")     -->     <browser name="explorer" useragent="MSIE"/>     <browser name="pocketexplorer" useragent="MSPIE"/>     <browser name="handweb" useragent="HandHTTP"/>     <browser name="avantgo" useragent="AvantGo"/>     <browser name="imode" useragent="DoCoMo"/>     <browser name="opera" useragent="Opera"/>     <browser name="lynx" useragent="Lynx"/>     <browser name="java" useragent="Java"/>     <browser name="wap" useragent="Nokia"/>     <browser name="wap" useragent="UP"/>     <browser name="wap" useragent="Wapalizer"/>     <browser name="mozilla5" useragent="Mozilla/5"/>     <browser name="mozilla5" useragent="Netscape6/"/>     <browser name="netscape" useragent="Mozilla"/>      </map:selector>    <map:selector name="coded" src="org.apache.cocoon.selection.CodedSelectorFactory"/>    <map:selector name="parameter" src="org.apache.cocoon.selection.ParameterSelectorFactory"/>   </map:selectors>        <map:match pattern="phone.xml">        <map:generate src="docs/phone.xml"/>              <map:select type="browser">                     <map:when test="wap">                       <map:transform src="stylesheets/phone2wap.xsl"/>                       <map:serialize type="wap"/>                     </map:when>                                         <map:otherwise>                       <map:transform src="stylesheets/phone2html.xsl"/>                       <map:serialize type="html"/>                     </map:otherwise>             </map:select>    </map:match>   Anybody know that is problem, please tell me.