我是amazonweb服务的新手，我正在尝试在amazonelasticmap上运行作业流，使用命令行界面工具减少作业。
我遵循了亚马逊开发者指南的步骤和aws开发者指南的步骤，但是我还不太清楚。
如果执行命令./elastic mapreduce--list列出作业流。显示以下错误。

/home/pdurai/Applications/elastic-mapreduce-cli/amazon/coral/httpdestinationhandler.rb:23: warning: else without rescue is useless
/usr/local/rbenv/versions/1.9.3-p194/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require': /home/pdurai/Applications/elastic-mapreduce-cli/amazon/coral/httpdestinationhandler.rb:19: syntax error, unexpected ':', expecting keyword_then or ',' or ';' or '\n' (SyntaxError)
/home/pdurai/Applications/elastic-mapreduce-cli/amazon/coral/httpdestinationhandler.rb:36: syntax error, unexpected keyword_end, expecting $end
    from /usr/local/rbenv/versions/1.9.3-p194/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
    from /home/pdurai/Applications/elastic-mapreduce-cli/amazon/coral/awsquery.rb:6:in `<top (required)>'
    from /usr/local/rbenv/versions/1.9.3-p194/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
    from /usr/local/rbenv/versions/1.9.3-p194/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
    from /home/pdurai/Applications/elastic-mapreduce-cli/amazon/coral/service.rb:8:in `<top (required)>'
    from /usr/local/rbenv/versions/1.9.3-p194/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
    from /usr/local/rbenv/versions/1.9.3-p194/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
    from /home/pdurai/Applications/elastic-mapreduce-cli/amazon/coral/elasticmapreduceclient.rb:6:in `<top (required)>'
    from /usr/local/rbenv/versions/1.9.3-p194/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
    from /usr/local/rbenv/versions/1.9.3-p194/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
    from /home/pdurai/Applications/elastic-mapreduce-cli/client.rb:6:in `<top (required)>'
    from /usr/local/rbenv/versions/1.9.3-p194/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
    from /usr/local/rbenv/versions/1.9.3-p194/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
    from /home/pdurai/Applications/elastic-mapreduce-cli/commands.rb:7:in `<top (required)>'
    from /usr/local/rbenv/versions/1.9.3-p194/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
    from /usr/local/rbenv/versions/1.9.3-p194/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
    from /home/pdurai/Applications/elastic-mapreduce-cli/elastic-mapreduce-cli.rb:5:in `<top (required)>'
    from /usr/local/rbenv/versions/1.9.3-p194/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
    from /usr/local/rbenv/versions/1.9.3-p194/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
    from ./elastic-mapreduce:6:in `<main>'

提前谢谢，谁能告诉我为什么我在列出工作流程时出现上述错误。