probleme avec Ant

Bonjour...

je suis un débutant en java. et je travaille sur un projet de GED (Gestion électronique de Document). J'ai vu un très bon outils OpenSource dans ce domaine qui me convient parfaitement. il s'agit de NUXEO EP la version 5.1.3.
J'ai trouver un très bon tuto pour son installation à partir de la récupération du code source via IDE éclipse (http://www.slideshare.net/JM.Pascal/...n-avec-eclipse). je travaille avec Eclipse Europa Version: 3.3.2
j'ai suivi le tuto sans probleme jusqu'à la partie de l'outils Ant et precisement à l'etape de la commande patch. Et lorsque je lance cette commande j'ai des erreurs dans la console que je ne comprend vraiment pas. Voici l'erreur qui s'affiche:

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Buildfile: C:\opt\Workspace-Nuxeo\Nuxeo-5.1.3\build.xml
patch-unix:
patch-windows:
     [echo] Running maven script jboss-patch/pom.xml
     [exec] [INFO] Scanning for projects...
     [exec] WAGON_VERSION: 1.0-beta-2
     [exec] [INFO] ------------------------------------------------------------------------
     [exec] [INFO] Building Nuxeo Platform: JBoss patch
     [exec] [INFO]    task-segment: [clean, package]
     [exec] [INFO] ------------------------------------------------------------------------
     [exec] [INFO] artifact org.codehaus.mojo:xml-maven-plugin: checking for updates from central_proxy
     [exec] [INFO] artifact org.codehaus.mojo:xml-maven-plugin: checking for updates from nuxeo_release
     [exec] [INFO] [clean:clean]
     [exec] [INFO] snapshot org.nuxeo.build:nuxeo-apt-extensions:1.0-SNAPSHOT: checking for updates from external_snapshot
     [exec] [INFO] snapshot org.nuxeo.build:nuxeo-apt-extensions:1.0-SNAPSHOT: checking for updates from nuxeo_snapshot
     [exec] Downloading: <a href="http://archiva.nuxeo.org/archiva/repository/external_snapshot/org/nuxeo/build/nuxeo-apt-extensions/1.0-SNAPSHOT/nuxeo-apt-extensions-1.0-SNAPSHOT.pom" target="_blank">http://archiva.nuxeo.org/archiva/rep...0-SNAPSHOT.pom</a>
     [exec] Downloading: <a href="http://archiva.nuxeo.org/archiva/repository/nuxeo_snapshot/org/nuxeo/build/nuxeo-apt-extensions/1.0-SNAPSHOT/nuxeo-apt-extensions-1.0-SNAPSHOT.pom" target="_blank">http://archiva.nuxeo.org/archiva/rep...0-SNAPSHOT.pom</a>
     [exec] Downloading: <a href="http://archiva.nuxeo.org/archiva/repository/external_snapshot/org/nuxeo/build/nuxeo-apt-extensions/1.0-SNAPSHOT/nuxeo-apt-extensions-1.0-SNAPSHOT.jar" target="_blank">http://archiva.nuxeo.org/archiva/rep...0-SNAPSHOT.jar</a>
     [exec] Downloading: <a href="http://archiva.nuxeo.org/archiva/repository/nuxeo_snapshot/org/nuxeo/build/nuxeo-apt-extensions/1.0-SNAPSHOT/nuxeo-apt-extensions-1.0-SNAPSHOT.jar" target="_blank">http://archiva.nuxeo.org/archiva/rep...0-SNAPSHOT.jar</a>
     [exec] [INFO] ------------------------------------------------------------------------
     [exec] [ERROR] BUILD ERROR
     [exec] [INFO] ------------------------------------------------------------------------
     [exec] [INFO] Failed to resolve artifact.
     [exec] Missing:
     [exec] ----------
     [exec] 1) org.nuxeo.build:nuxeo-apt-extensions:jar:1.0-SNAPSHOT
     [exec]   Try downloading the file manually from the project website.
     [exec]   Then, install it using the command: 
     [exec]       mvn install:install-file -DgroupId=org.nuxeo.build -DartifactId=nuxeo-apt-extensions -Dversion=1.0-SNAPSHOT -Dpackaging=jar -Dfile=/path/to/file
     [exec]   Alternatively, if you host your own repository you can deploy the file there: 
     [exec]       mvn deploy:deploy-file -DgroupId=org.nuxeo.build -DartifactId=nuxeo-apt-extensions -Dversion=1.0-SNAPSHOT -Dpackaging=jar -Dfile=/path/to/file -Durl=[url] -DrepositoryId=[id]
     [exec]   Path to dependency: 
     [exec]   	1) org.nuxeo.ecm.platform:jboss-patch:pom:4.0.5.GA-SNAPSHOT
     [exec]   	2) org.nuxeo.build:nuxeo-apt-extensions:jar:1.0-SNAPSHOT
     [exec] ----------
     [exec] 1 required artifact is missing.
     [exec] for artifact: 
     [exec]   org.nuxeo.ecm.platform:jboss-patch:pom:4.0.5.GA-SNAPSHOT
     [exec] from the specified remote repositories:
     [exec]   central_proxy (http://archiva.nuxeo.org/archiva/repository/central),
     [exec]   external_snapshot (http://archiva.nuxeo.org/archiva/repository/external_snapshot),
     [exec]   nuxeo_snapshot (http://archiva.nuxeo.org/archiva/repository/nuxeo_snapshot),
     [exec]   nuxeo_release (http://archiva.nuxeo.org/archiva/repository/nuxeo_release),
     [exec]   central (http://repo1.maven.org/maven2)
     [exec] [INFO] ------------------------------------------------------------------------
     [exec] [INFO] For more information, run Maven with the -e switch
     [exec] [INFO] ------------------------------------------------------------------------
     [exec] [INFO] Total time: 9 seconds
     [exec] [INFO] Finished at: Sat Feb 20 10:09:55 GMT 2010
     [exec] [INFO] Final Memory: 17M/254M
     [exec] [INFO] ------------------------------------------------------------------------
 
BUILD FAILED
C:\opt\Workspace-Nuxeo\Nuxeo-5.1.3\build.xml:107: exec returned: 1

Aidez moi s'il vous plait.