title: Error in grails 2.3.7 app while running and cleaning
body: <p>I have cloned an app from git,  <em>grails-clean</em> command was giving the below errors</p>
  
  <p>::::::::::::::::::::::::::::::::::::::::::::::</p>
  
  <p>::          UNRESOLVED DEPENDENCIES         ::</p>
  
  <p>::::::::::::::::::::::::::::::::::::::::::::::</p>
  
  <p>:: org.apache.tomcat.embed#tomcat-embed-core;7.0.52: not found</p>
  
  <p>:: org.apache.tomcat#tomcat-catalina-ant;7.0.52: not found</p>
  
  <p>:: org.apache.tomcat.embed#tomcat-embed-jasper;7.0.52: not found</p>
  
  <p>:: org.apache.tomcat.embed#tomcat-embed-logging-log4j;7.0.52: no</p>
  
  <p>:: org.apache.tomcat.embed#tomcat-embed-websocket;7.0.52: not fo</p>
  
  <p>:: org.zkoss.zk#zk;7.0.1: not found</p>
  
  <p>:: org.zkoss.zk#zkplus;7.0.1: not found</p>
  
  <p>:: org.grails.plugins#zk;2.4.0: not found</p>
  
  <p>:: com.ibm.icu#icu4j;4.8.1.1: not found</p>
  
  <p>:: commons-pool#commons-pool;1.5.4: not found</p>
  
  <p>:: org.grails.plugins#functional-test;2.0.0: not found</p>
  
  <p>::::::::::::::::::::::::::::::::::::::::::::::</p>
  
  <p>I have changed tomcat-dependency to below in buildConfig.groovy</p>
  
  <p><strong>build ":tomcat:7.0.52.1"</strong></p>
  
  <p>After this, the app is not even responding on <em>grails-clean</em>, No lines gets printed in the console, except “Configuring classpath”</p>
  
  <p>So, I have created a <strong>grails 2.3.7 sample app</strong>, When I run it, I got the error as below:</p>
  
  <p>| Error Resolve error obtaining dependencies: Failed to read artifact descriptor
  for xalan:serializer:jar:2.7.1 (Use --stacktrace to see the full trace)
  | Error Required Grails build dependencies were not found. This is normally due
  to internet connectivity issues (such as a misconfigured proxy) or missing repos
  itories in grails-app/conf/BuildConfig.groovy. Please verify your configuration
  to continue.</p>
  
  <p>I have grails 2.2.1, There are no issues with the apps in this versions</p>
  
  <p><strong>OS: Windows 8
     , Java version: 1.6.0_81</strong></p>