Most likely, your ~/.m2/repository dir has some corrupt metadata in it. That occurs from time to time with maven.
I would suggest doing a
rm -rf ~/.m2/repository/org/apache/maven/plugins/maven-site-plugin
and see if that helps.
i solved problem adding please add this block in pom.xml -
Edited by: jigargajjar on Nov 7, 2007 7:27 AM