title: "an error occurred while collecting items to be installed" on eclipse "check for updates"
body: <p>I'm trying to update Eclipse plugins (using "Check for Updates") but I keep getting a long list of errors. I assume it is something wrong with the list of update sites but I've been able to update before. Any idea what I'm doing wrong?</p>
  
  <p>(Goes on like this for many lines...)</p>
  
  <pre><code>An error occurred while collecting items to be installed
  session context was:(profile=epp.package.jee, phase=org.eclipse.equinox.internal.p2.engine.phases.Collect, operand=, action=).
  No repository found containing: osgi.bundle,ch.qos.logback.slf4j,1.0.7.v20121108-1250
  No repository found containing: osgi.bundle,com.google.appengine.eclipse.core,3.2.4.v201306061638-rel-r42
  No repository found containing: osgi.bundle,com.google.appengine.eclipse.datatools,3.2.4.v201306061638-rel-r42
  No repository found containing: osgi.bundle,com.google.appengine.eclipse.webtools,3.2.4.v201306061638-rel-r42
  No repository found containing: osgi.bundle,com.google.appengine.eclipse.webtools.e42,3.2.4.v201306061638-rel-r42
  No repository found containing: osgi.bundle,com.google.gdt.eclipse.appengine.rpc,3.2.4.v201306061638-rel-r42
  No repository found containing: osgi.bundle,com.google.gdt.eclipse.appengine.swarm,3.2.4.v201306061638-rel-r42
  No repository found containing: osgi.bundle,com.google.gdt.eclipse.appengine.swarm_backend,3.2.4.v201306061638-rel-r42
  No repository found containing: osgi.bundle,com.google.gdt.eclipse.appsmarketplace,3.2.4.v201306061638-rel-r42
  No repository found containing: osgi.bundle,com.google.gdt.eclipse.core,3.2.4.v201306061638-rel-r42
  No repository found containing: osgi.bundle,com.google.gdt.eclipse.gph,3.2.4.v201306061638-rel-r42
  No repository found containing: osgi.bundle,com.google.gdt.eclipse.gph.e36,3.2.4.v201306061638-rel-r42
  No repository found containing: osgi.bundle,com.google.gdt.eclipse.gph.hge,3.2.4.v201306061638-rel-r42
  No repository found containing: osgi.bundle,com.google.gdt.eclipse.gph.subclipse,3.2.4.v201306061638-rel-r42
  No repository found containing: osgi.bundle,com.google.gdt.eclipse.gph.subversive,3.2.4.v201306061638-rel-r42
  No repository found containing: osgi.bundle,com.google.gdt.eclipse.login,3.2.4.v201306061638-rel-r42
  No repository found containing: osgi.bundle,com.google.gdt.eclipse.managedapis,3.2.4.v201306061638-rel-r42
  No repository found containing: osgi.bundle,com.google.gdt.eclipse.maven,3.2.4.v201306061638-rel-r42
  No repository found containing: osgi.bundle,com.google.gdt.eclipse.maven.e37,3.2.4.v201306061638-rel-r42
  No repository found containing: osgi.bundle,com.google.gdt.eclipse.platform,3.2.4.v201306061638-rel-r42
  No repository found containing: osgi.bundle,com.google.gdt.eclipse.platform.e42,3.2.4.v201306061638-rel-r42
  No repository found containing: osgi.bundle,com.google.gdt.eclipse.platform.shared,3.2.4.v201306061638-rel-r42
  No repository found containing: osgi.bundle,com.google.gdt.eclipse.suite,3.2.4.v201306061638-rel-r42
  No repository found containing: osgi.bundle,com.google.gdt.eclipse.suite.ext,3.2.4.v201306061638-rel-r42
  No repository found containing: osgi.bundle,com.google.gwt.eclipse.core,3.2.4.v201306061638-rel-r42
  No repository found containing: osgi.bundle,com.google.gwt.eclipse.oophm,3.2.4.v201306061638-rel-r42
  </code></pre>