using this tutorial http://www.eclipse.org/birt/phoenix/deploy/viewerSetup.php#install_viewer
And it tells me to display the Tomcat manager application through this
Make sure you activated the manager app and created a user that has access to it. For details see the documentation to your Tomcat-Version (e.g. for Tomcat 7: http://tomcat.apache.org/tomcat-7.0-doc/manager-howto.html )