R – when I am deploy the ror application on production then I am getting following error

in gem_original_require': no such file to load -- haml (MissingSourceFile)

but this gem already istalled.

I have also plugin for this path :-/home/techvant/rails_app/techease/vendor/plugins/haml/init.rb

this init file having following code : –

    begin
         require File.join(File.dirname(__FILE__), 'lib', 'haml') # From here
       rescue LoadError
         require 'haml' # From gem
    end

What do I need to resolve this error please help.

Following is the error trace.

/usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in gem_original_require': no such file to load -- haml (MissingSourceFile) from /usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in require'
from /usr/lib/ruby/gems/1.8/gems/activesupport-2.3.2/lib/active_support/dependencies.rb:156:in require' from /usr/lib/ruby/gems/1.8/gems/activesupport-2.3.2/lib/active_support/dependencies.rb:521:in new_constants_in'
from /usr/lib/ruby/gems/1.8/gems/activesupport-2.3.2/lib/active_support/dependencies.rb:156:in require' from /home/techvant/rails_app/techease/vendor/plugins/haml/init.rb:4:in evaluate_init_rb'
from /usr/lib/ruby/gems/1.8/gems/rails-2.3.2/lib/rails/plugin.rb:146:in evaluate_init_rb' from /usr/lib/ruby/gems/1.8/gems/activesupport-2.3.2/lib/active_support/core_ext/kernel/reporting.rb:11:in silence_warnings'
from /usr/lib/ruby/gems/1.8/gems/rails-2.3.2/lib/rails/plugin.rb:142:in evaluate_init_rb' from /usr/lib/ruby/gems/1.8/gems/rails-2.3.2/lib/rails/plugin.rb:48:in load'
from /home/techvant/rails_app/techease/config/../vendor/plugins/siteninja/engines/lib/engines/plugin.rb:77:in load' from /usr/lib/ruby/gems/1.8/gems/rails-2.3.2/lib/rails/plugin/loader.rb:38:in load_plugins'
from /usr/lib/ruby/gems/1.8/gems/rails-2.3.2/lib/rails/plugin/loader.rb:37:in each' from /usr/lib/ruby/gems/1.8/gems/rails-2.3.2/lib/rails/plugin/loader.rb:37:in load_plugins'
from /usr/lib/ruby/gems/1.8/gems/rails-2.3.2/lib/initializer.rb:348:in load_plugins' from /usr/lib/ruby/gems/1.8/gems/rails-2.3.2/lib/initializer.rb:163:in process'
from /usr/lib/ruby/gems/1.8/gems/rails-2.3.2/lib/initializer.rb:113:in send' from /usr/lib/ruby/gems/1.8/gems/rails-2.3.2/lib/initializer.rb:113:in run'
from /home/techvant/rails_app/techease/config/environment.rb:9
from /usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in gem_original_require' from /usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in require'
from /usr/lib/ruby/gems/1.8/gems/activesupport-2.3.2/lib/active_support/dependencies.rb:156:in require' from /usr/lib/ruby/gems/1.8/gems/activesupport-2.3.2/lib/active_support/dependencies.rb:521:in new_constants_in'
from /usr/lib/ruby/gems/1.8/gems/activesupport-2.3.2/lib/active_support/dependencies.rb:156:in require' from /usr/lib/ruby/gems/1.8/gems/rails-2.3.2/lib/commands/server.rb:84 from /usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in gem_original_require'
from /usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `require'
from script/server:3