title: Installing Software Error in Eclipse
body: <p>I'm wanna install new software in eclipse luna version, but it has error during the installation!
  The error is:</p>
  
  <pre><code>An error occurred during the org.eclipse.equinox.internal.p2.engine.phases.CheckTrust phase.
  session context was:(profile=epp.package.java, phase=org.eclipse.equinox.internal.p2.engine.phases.CheckTrust, operand=, action=).
  Error reading signed content.
  error in opening zip file
  </code></pre>
  
  <p>What should I've done?
  Please help me.</p>