Ruby gem UPnP session with errors

ruby-1.9.3-p0@upnp [me@myhost upnp]$ gem list

*** LOCAL GEMS ***

bundler (1.1.0)
ruby-1.9.3-p0@upnp [me@myhost upnp]$ gem install UPnP
Fetching: httpclient-2.2.4.gem (100%)
Fetching: soap4r-1.5.8.gem (100%)
WARNING: soap4r-1.5.8 has an invalid nil value for @cert_chain
Fetching: builder-3.0.0.gem (100%)
Fetching: UPnP-1.2.0.gem (100%)
Successfully installed httpclient-2.2.4
Successfully installed soap4r-1.5.8
Successfully installed builder-3.0.0
Successfully installed UPnP-1.2.0
4 gems installed
Installing ri documentation for httpclient-2.2.4...
Installing ri documentation for soap4r-1.5.8...
Installing ri documentation for builder-3.0.0...
unable to convert "\xF1" from ASCII-8BIT to UTF-8 for README, skipping
unable to convert "\xF1" from ASCII-8BIT to UTF-8 for README.rdoc,
skipping
Installing ri documentation for UPnP-1.2.0...
Installing RDoc documentation for httpclient-2.2.4...
Installing RDoc documentation for soap4r-1.5.8...
Installing RDoc documentation for builder-3.0.0...
unable to convert "\xF1" from ASCII-8BIT to UTF-8 for README, skipping
unable to convert "\xF1" from ASCII-8BIT to UTF-8 for README.rdoc,
skipping
Installing RDoc documentation for UPnP-1.2.0...
ruby-1.9.3-p0@upnp [me@myhost upnp]$ which upnp_discover
/usr/local/rvm/gems/ruby-1.9.3-p0@upnp/bin/upnp_discover
ruby-1.9.3-p0@upnp [me@myhost upnp]$  upnp_discover
/usr/local/rvm/gems/ruby-1.9.3-p0@upnp/gems/UPnP-1.2.0/lib/UPnP.rb:1:
warning: variable $KCODE is no longer effective; ignored
/usr/local/rvm/gems/ruby-1.9.3-p0@upnp/gems/soap4r-1.5.8/lib/xsd/charset.rb:13:
warning: variable $KCODE is no longer effective
/usr/local/rvm/rubies/ruby-1.9.3-p0/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in
`require': iconv will be deprecated in the future, use String#encode
instead.
/usr/local/rvm/gems/ruby-1.9.3-p0@upnp/gems/soap4r-1.5.8/lib/xsd/xmlparser.rb:74:in
`<top (required)>': XML processor module not found. (RuntimeError)
  from
/usr/local/rvm/rubies/ruby-1.9.3-p0/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in
`require'
  from
/usr/local/rvm/rubies/ruby-1.9.3-p0/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in
`require'
  from
/usr/local/rvm/gems/ruby-1.9.3-p0@upnp/gems/soap4r-1.5.8/lib/soap/parser.rb:9:in
`<top (required)>'
  from
/usr/local/rvm/rubies/ruby-1.9.3-p0/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in
`require'
  from
/usr/local/rvm/rubies/ruby-1.9.3-p0/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in
`require'
  from
/usr/local/rvm/gems/ruby-1.9.3-p0@upnp/gems/soap4r-1.5.8/lib/soap/processor.rb:12:in
`<top (required)>'
  from
/usr/local/rvm/rubies/ruby-1.9.3-p0/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in
`require'
  from
/usr/local/rvm/rubies/ruby-1.9.3-p0/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in
`require'
  from
/usr/local/rvm/gems/ruby-1.9.3-p0@upnp/gems/soap4r-1.5.8/lib/soap/rpc/proxy.rb:10:in
`<top (required)>'
  from
/usr/local/rvm/rubies/ruby-1.9.3-p0/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in
`require'
  from
/usr/local/rvm/rubies/ruby-1.9.3-p0/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in
`require'
  from
/usr/local/rvm/gems/ruby-1.9.3-p0@upnp/gems/soap4r-1.5.8/lib/soap/rpc/driver.rb:12:in
`<top (required)>'
  from
/usr/local/rvm/rubies/ruby-1.9.3-p0/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in
`require'
  from
/usr/local/rvm/rubies/ruby-1.9.3-p0/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in
`require'
  from
/usr/local/rvm/gems/ruby-1.9.3-p0@upnp/gems/UPnP-1.2.0/lib/UPnP/control/service.rb:6:in
`<top (required)>'
  from
/usr/local/rvm/rubies/ruby-1.9.3-p0/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in
`require'
  from
/usr/local/rvm/rubies/ruby-1.9.3-p0/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in
`require'
  from
/usr/local/rvm/gems/ruby-1.9.3-p0@upnp/gems/UPnP-1.2.0/lib/UPnP/control/device.rb:7:in
`<top (required)>'
  from
/usr/local/rvm/rubies/ruby-1.9.3-p0/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in
`require'
  from
/usr/local/rvm/rubies/ruby-1.9.3-p0/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in
`require'
  from
/usr/local/rvm/gems/ruby-1.9.3-p0@upnp/gems/UPnP-1.2.0/lib/UPnP/control.rb:9:in
`<top (required)>'
  from
/usr/local/rvm/rubies/ruby-1.9.3-p0/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in
`require'
  from
/usr/local/rvm/rubies/ruby-1.9.3-p0/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in
`require'
  from
/usr/local/rvm/gems/ruby-1.9.3-p0@upnp/gems/UPnP-1.2.0/lib/UPnP/SSDP.rb:8:in
`<top (required)>'
  from
/usr/local/rvm/rubies/ruby-1.9.3-p0/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in
`require'
  from
/usr/local/rvm/rubies/ruby-1.9.3-p0/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in
`require'
  from
/usr/local/rvm/gems/ruby-1.9.3-p0@upnp/gems/UPnP-1.2.0/bin/upnp_discover:3:in
`<top (required)>'
  from /usr/local/rvm/gems/ruby-1.9.3-p0@upnp/bin/upnp_discover:19:in
`load'
  from /usr/local/rvm/gems/ruby-1.9.3-p0@upnp/bin/upnp_discover:19:in
`<main>'
ruby-1.9.3-p0@upnp [me@myhost upnp]$