Obtenir une erreur "Aucun dépôt trouvé" dans Eclipse (Ganymede) en essayant d'installer google plugins (GWT)

Je suis en train d'installer le Google Web Toolkit for Eclipse (Ganymède), et je reçois l'erreur suivante.

An error occurred while collecting items to be installed
  No repository found containing: org.eclipse.emf.common/osgi.bundle/2.4.0.v200808251517
  No repository found containing: org.eclipse.emf.ecore/osgi.bundle/2.4.1.v200808251517
  No repository found containing: org.eclipse.emf.ecore.change/osgi.bundle/2.4.0.v200808251517
  No repository found containing: org.eclipse.emf.ecore.edit/osgi.bundle/2.4.1.v200808251517
  No repository found containing: org.eclipse.emf.ecore.xmi/osgi.bundle/2.4.1.v200808251517
  No repository found containing: org.eclipse.emf.edit/osgi.bundle/2.4.1.v200808251517
  No repository found containing: org.eclipse.wst.common.emf/osgi.bundle/1.1.202.v200809111955
  No repository found containing: org.eclipse.wst.common.emfworkbench.integration/osgi.bundle/1.1.201.v200808071700
  No repository found containing: org.eclipse.wst.common.frameworks/osgi.bundle/1.1.200.v200805140020
  No repository found containing: org.eclipse.wst.common.project.facet.core/osgi.bundle/1.3.3.v200809102124
  No repository found containing: org.eclipse.wst.sse.core/osgi.bundle/1.1.302.v200808260045
  No repository found containing: org.eclipse.wst.sse.ui/osgi.bundle/1.1.2.v200809120159
  No repository found containing: org.eclipse.wst.validation/osgi.bundle/1.2.2.v200809050219
  No repository found containing: org.eclipse.wst.xml.core/osgi.bundle/1.1.305.v200809120354

Quoi de cette erreur, et comment puis-je installer les plugins.
C'est une nouvelle installation d'Eclipse et Vista 64 bits.
J'ai utilisé "http://dl.google.com/eclipse/plugin/3.4" comme google plugin emplacement.

source d'informationauteur seanyboy