title: issue when building the project in netbeans 7.1.2?
body: <p>I have a project in netbeans 7.1.2 and i get the following problem while i try to build the project  </p>
  
  <pre><code>D:\netbeans_workspace\Servlets-DWR\nbproject\build-impl.xml:479: The libs.CopyLibs.classpath property is not set up.
  This property must point to 
  org-netbeans-modules-java-j2seproject-copylibstask.jar file which is part
  of NetBeans IDE installation and is usually located at 
  &lt;netbeans_installation&gt;/java&lt;version&gt;/ant/extra folder.
  Either open the project in the IDE and make sure CopyLibs library
  exists or setup the property manually. For example like this:
   ant -Dlibs.CopyLibs.classpath=a/path/to/org-netbeans-modules-java-j2seproject-copylibstask.jar
  BUILD FAILED (total time: 0 seconds)
  </code></pre>