i execute " gem install feedtools" something wrong so that i can't use FeedTools,can someone help?

gistfile1.txt

Install:
root@kali:~# gem install feedtools
Fetching: feedtools-0.2.29.gem (100%)

FeedTool's caching schema has changed to allow Feed objects to be
serialized to the cache.  This should offer some limited speed up
in some cases.

Successfully installed feedtools-0.2.29
1 gem installed
Installing ri documentation for feedtools-0.2.29...
unable to convert "\xA6" from ASCII-8BIT to UTF-8 for lib/feed_tools/vendor/html5/testdata/encoding/chardet/test_big5.txt, skipping
Installing RDoc documentation for feedtools-0.2.29...
unable to convert "\xA6" from ASCII-8BIT to UTF-8 for lib/feed_tools/vendor/html5/testdata/encoding/chardet/test_big5.txt, skipping

code :
#encoding:utf-8
require 'rubygems'
require 'feed_tools'

execute:

/usr/bin/ruby -e $stdout.sync=true;$stderr.sync=true;load($0=ARGV.shift) /root/RubymineProjects/msf/Fourteen/FeddTools_test1.rb
/usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require': iconv will be deprecated in the future, use String#encode instead.
/usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require': /var/lib/gems/1.9.1/gems/feedtools-0.2.29/lib/feed_tools/helpers/uri_helper.rb:43: invalid multibyte char (US-ASCII) (SyntaxError)
/var/lib/gems/1.9.1/gems/feedtools-0.2.29/lib/feed_tools/helpers/uri_helper.rb:43: invalid multibyte char (US-ASCII)
/var/lib/gems/1.9.1/gems/feedtools-0.2.29/lib/feed_tools/helpers/uri_helper.rb:43: syntax error, unexpected $end, expecting ')'
          if IDN::Idna.toASCII('http://www.詹姆斯.com/') ==
                                             ^
	from /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
	from /var/lib/gems/1.9.1/gems/feedtools-0.2.29/lib/feed_tools/helpers/retrieval_helper.rb:25:in `<top (required)>'
	from /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
	from /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
	from /var/lib/gems/1.9.1/gems/feedtools-0.2.29/lib/feed_tools/feed.rb:27:in `<top (required)>'
	from /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
	from /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
	from /var/lib/gems/1.9.1/gems/feedtools-0.2.29/lib/feed_tools.rb:170:in `<top (required)>'
	from /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:60:in `require'
	from /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:60:in `rescue in require'
	from /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:35:in `require'
	from /root/RubymineProjects/msf/Fourteen/FeddTools_test1.rb:3:in `<top (required)>'
	from -e:1:in `load'
	from -e:1:in `<main>'

Process finished with exit code 1