title: Xcode 4.3 installaiton error in Mac OS X 10.7.3?
body: <p>We have bought a new iMac with <code>Mac Os X 10.7.3 Lion</code> version. I have tried to install the <code>Xcode 4.3</code> from Applications. But when i have tried to install the Xcode it is showing <code>"A Unknown error occurred. See the install log for more details"</code>. But i don't have any error logs in <code>install.log file</code>. I found the error in <code>all messages.log file</code>. I can't understand what is wrong. I have mentioned the error log here,</p>
  
  <pre><code>com.apple.SecurityServer: Failed to authorize right 'system.install.app-store-software' by client '/System/Library/PrivateFrameworks/PackageKit.framework/Versions/A/Resources/installd' [744] for authorization created by '/Applications/Xcode.app' [735]
  </code></pre>
  
  <p>Can anyone please help to install the Xcode 4.3 and go ahead to work? Thanks in advance.</p>