Topic: unable to render the spree nav_bar in home page

In my application iam using spree 0.70 with rails 3.1.1 and ruby-1.9.3p125. I overrided spree_application.html.erb by placing the file in layout folder. Even i copied head.html.erb file and placed in shared folder.  When i run the page in production iam unable to render nav_bar.

iam getting

Rendered /usr/local/rvm/gems/ruby-1.9.3-p125@server/gems/spree_core-0.70.1/app/views/shared/_taxonomies.html.erb (14.0ms)
Rendered /usr/local/rvm/gems/ruby-1.9.3-p125@server/gems/spree_core-0.70.1/app/views/shared/_filters.html.erb (1.0ms)
[ Currency ] :#<NoMethodError: undefined method `currency_converters' for nil:NilClass>
Rendered /usr/local/rvm/gems/ruby-1.9.3-p125@server/gems/spree_core-0.70.1/app/views/shared/_products.html.erb (112.8ms)
Rendered /usr/local/rvm/gems/ruby-1.9.3-p125@server/gems/spree_core-0.70.1/app/views/taxons/show.html.erb within layouts/spree_application (129.5ms)
Rendered shared/_head.html.erb (3.1ms)
Rendered /usr/local/rvm/gems/ruby-1.9.3-p125@server/gems/spree_core-0.70.1/app/views/shared/_nav_bar.html.erb (0.0ms)
Rendered /usr/local/rvm/gems/ruby-1.9.3-p125@server/gems/spree_core-0.70.1/app/views/shared/_google_analytics.html.erb (0.7ms)





what should i do to get the spree nav_bar in my home page.