sosol-error

NativeException (java.io.IOException: Server returned HTTP response code: 502 for URL: http://epidoc.googlecode.com/files/exp-epidoc.rng):
  sun/net/www/protocol/http/HttpURLConnection.java:1313:in `getInputStream'
  com/sun/org/apache/xerces/internal/impl/XMLEntityManager.java:677:in `setupCurrentEntity'
  com/sun/org/apache/xerces/internal/impl/XMLVersionDetector.java:186:in `determineDocVersion'
  com/sun/org/apache/xerces/internal/parsers/XML11Configuration.java:771:in `parse'
  com/sun/org/apache/xerces/internal/parsers/XML11Configuration.java:737:in `parse'
  com/sun/org/apache/xerces/internal/parsers/XMLParser.java:107:in `parse'
  com/sun/org/apache/xerces/internal/parsers/AbstractSAXParser.java:1205:in `parse'
  com/sun/org/apache/xerces/internal/jaxp/SAXParserImpl.java:522:in `parse'
  com.thaiopensource.relaxng.parse.sax.SAXParseable:-1:in `parse'
  com.thaiopensource.relaxng.impl.SchemaBuilderImpl:-1:in `parse'
  com.thaiopensource.relaxng.jarv.VerifierFactoryImpl:-1:in `compileSchema'
  org/iso_relax/verifier/VerifierFactory.java:123:in `compileSchema'
  lib/jruby_xml.rb:68:in `initialize'
  file:lib/jruby-stdlib-1.4.0.jar!/META-INF/jruby.home/lib/ruby/1.8/singleton.rb:94:in `new'
  file:lib/jruby-stdlib-1.4.0.jar!/META-INF/jruby.home/lib/ruby/1.8/singleton.rb:94:in `instance'
  app/models/identifier.rb:55:in `is_valid_xml?'
  app/models/identifier.rb:209:in `set_xml_content'
  app/models/ddb_identifier.rb:111:in `set_leiden_plus'
  app/controllers/ddb_identifiers_controller.rb:20:in `update'
  haml (2.2.4) [v] lib/sass/plugin/rails.rb:19:in `process'
  file:lib/jruby-rack-0.9.5.jar!/rack/adapter/rails.rb:35:in `serve_rails'
  file:lib/jruby-rack-0.9.5.jar!/rack/adapter/rails.rb:40:in `call'
  file:lib/jruby-rack-0.9.5.jar!/jruby/rack/rails.rb:148:in `call'
  file:lib/jruby-rack-0.9.5.jar!/rack/handler/servlet.rb:18:in `call'
  :1