Fog compute error for azure

[shruthirajk]

I am a beginner in ruby.I have a sample code for azure connect in ruby.
require 'fog'
require 'pp'
require 'azure'
require 'fog-azure'

module Fog
module Compute

class Azure < Fog::Compute.new(
:provider => 'Azure',
:azure_sub_id => 'sub_id ',
:azure_pem => '/home/test/Azureuser.pem',
:publish_method => 'AzureServiceManagementAPI',
:azure_access_keys => 'access_key',

)
end
end
end

I get the below error:

/usr/local/lib/ruby/1.9.1/yaml.rb:84:in <top (required)>': It seems your ruby installation is missing psych (for YAML output). To eliminate this warning, please install libyaml and reinstall your ruby. /usr/local/lib/ruby/1.9.1/rubygems/custom_require.rb:36:inrequire': cannot load such file -- fog-azure (LoadError)
from /usr/local/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in require' from azure_test.rb:6:in

'
If anyone could help me in resolving this issue.

[aheumaier]

Use

require 'fog/azure'

to load internal lib