[xwiki-users] xwiki installation with xwiki-enterprise-web-5.1-milestone-1.war?

i downloaded the latest version of xwiki i.e xwiki-enterprise-web-5.1-milestone-1.war file and put it in <Tomcat_HomeDirectory>/xwiki ax extracted folder. Now when startup the tomcat i am getting below error Jun 11, 2013 12:32:30 PM org.apache.catalina.core.StandardContext listenerStart SEVERE: Exception sending context initialized event to listener instance of class org.xwiki.container.servlet.XWikiServletContextListener java.lang.NoClassDefFoundError: Failed to get fields for class [org.xwiki.extension.internal.DefaultExtensionLicenseManager] because the class [org/reflections/Configuration] couldn't be found in the ClassLoader. at org.xwiki.component.util.ReflectionUtils.getAllFields(ReflectionUtils.java:71) at org.xwiki.component.annotation.ComponentDescriptorFactory.createComponentDescriptor(ComponentDescriptorFactory.java:132) at org.xwiki.component.annotation.ComponentDescriptorFactory.createComponentDescriptors(ComponentDescriptorFactory.java:105) Am i missing some library?