title: Upgrade application to Grails 2.1.1
body: <p>i have upgraded a grails application using <code>grails upgrade</code> command. But the problem is when i try to run the application using <code>grails run-app</code>, it shows unresolved dependency error as mentioned: | Error Failed to resolve dependencies (Set log level to 'warn' in BuildConfig.
  roovy for more information):</p>
  
  <ul>
  <li>org.springframework.security:org.springframework.security.core:3.0.2.RELEASE</li>
  <li>org.springframework.security:org.springframework.security.web:3.0.2.RELEASE</li>
  </ul>
  
  <p>What should i do to resolved dependencies and run the application. I tried to clean app using <code>grails clean</code> and also tried to install the dependencies with no success.</p>
  
  <p>Any help will be appreciable.
  Thanks.</p>