Rails3 ActionView Template Handlers doesn't work on Production Server

I am using Rails 3.2.3 / Ruby 1.9.3p125 / jbuilder (0.4.0)

In my view/mycontroller folder i got a show.json.jbuilder file. when I test everything on my local machine with rails s -e production everything works fine. The JSON gets rendered as espected.

But when I deploy to Ubuntu LTS (nginx/unicorn) I get the following Error Message:

ActionView::MissingTemplate (Missing template mycontroller/show, application/show with {:locale=>[:de, :en], :formats=>[:json], :handlers=>[:erb, :builder]}. Searched in:
  * "/home/deployer/apps/myapp/releases/#############/app/views"
):

When I check on my server if the jbuilder gem is installed with bundle show jbuilder everything seems right.

weird is that the Error message does't show :handlers=>[:erb, :builder, :jbuilder] The jbuilder handler is obviously missing. But how do I solve the problem?

Edit: The Problem is not based on Jbuilder. I tried rabl and the same problem appears.

Does any one has a hint, how to debug this?

Here some more Information:

Gemfile

source 'https://rubygems.org'

gem 'rails', '3.2.3'
gem 'jquery-rails'
gem 'mysql2'
gem 'simple_form'

# Gems used only for assets and not required
# in production environments by default.
group :assets do
  gem 'sass-rails',   '~> 3.2.3'
  gem 'coffee-rails', '~> 3.2.1'
  gem 'uglifier', '>= 1.0.3'
  gem 'bootstrap-sass', '2.0.2'
end

# Use unicorn as the app server
gem 'unicorn'

# Deploy with Capistrano
gem 'capistrano'

# for performance monitoring
gem 'newrelic_rpm'

# use asset pipline and flash
gem 'swf_fu', '~> 2.0'

gem 'geocoder'

# To use Jbuilder templates for JSON
gem 'jbuilder'

Controller

  def show

  end

show.json.jbuilder - file

 json.(@map, :id)