mvn antprops failed

I just followed the developer instructions to build trunk but the "mvn
antprops:generate" command failed.

I received this maven error message below. I don't really know maven,
isn't it possible that a repository definition is missing from the pom file?



Downloading:
http://maven.sateh.com/repository/org/apache/maven/plugins/maven-site-plugin/2.0-beta- 
6
/maven-site-plugin-2.0-beta-6.pom
[INFO]
------------------------------------------------------------------------
[ERROR] BUILD ERROR
[INFO]
------------------------------------------------------------------------
[INFO] Error building POM (may not be this project's POM).


Project ID: org.apache.maven.plugins:maven-site-plugin

Reason: POM 'org.apache.maven.plugins:maven-site-plugin' not found in
repository: Unable to download
 the artifact from any repository

  org.apache.maven.plugins:maven-site-plugin:pom:2.0-beta-6

from the specified remote repositories:
  jtrac.info (http://j-trac.sourceforge.net/repository),
  sateh.com (http://maven.sateh.com/repository),
  openqa.org (http://maven.openqa.org)
 for project org.apache.maven.plugins:maven-site-plugin


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