XSD parser error

I can not use the XSD::TestXMLSchemaParser >ruby

xmlschemaparser.rbLoaded suite xmlschemaparserStartedEFinished in 0.015
seconds. 1) Error:test_wsdl(XSD::TestXMLSchemaParser):NameError:
uninitialized constant WSDL::XMLSchema::Parser::Documentation
c:/ruby/lib/ruby/1.8/wsdl/xmlSchema/parser.rb:131:in decode_tag' c:/ruby/lib/ruby/1.8/wsdl/xmlSchema/parser.rb:82:in start_element’
c:/ruby/lib/ruby/1.8/xsd/xmlparser/parser.rb:67:in start_element' c:/ruby/lib/ruby/1.8/xsd/xmlparser/xmlparser.rb:34:in do_parse’
c:/ruby/lib/ruby/1.8/xsd/xmlparser/xmlparser.rb:31:in do_parse' c:/ruby/lib/ruby/1.8/wsdl/xmlSchema/parser.rb:63:in parse’
xmlschemaparser.rb:14:in `test_wsdl’1 tests, 0 assertions, 0 failures, 1
errorsignored attr: {Java Architecture for XML Binding (JAXB) Bindings Schema for JAXB}versionignored
element: {http://www.w3.org/2001/XMLSchema}minInclusive of
WSDL::XMLSchema::SimpleRestriction>Exit code: 1