Getting a Rack GemNotFound with Sinatra

This is my first attempt with a ruby stack. I'm stuck with the following error:

Could not find rack-1.6.4 in any of the sources (Bundler::GemNotFound)

I've successfully installed the following components:

ubuntu 14.04.3 LTS

rvm 1.26.11

ruby 2.1.6p336

nginx 1.8

* LOCAL GEMS *

bigdecimal (1.2.4)

bundler (1.10.6)

bundler-unload (1.0.2)

executable-hooks (1.3.2)

gem-wrappers (1.2.7)

io-console (0.4.3)

json (1.8.1)

minitest (4.7.5)

psych (2.0.5)

rack (1.6.4)

rack-protection (1.5.3)

rake (10.1.0)

rdoc (4.1.0)

rubygems-bundler (1.4.4)

rvm (1.11.3.9)

sinatra (1.4.6)

test-unit (2.1.6.0)

tilt (2.0.1)

* Gemfile *

gem 'sinatra', '1.4.6'

* Gemfile.lock *

GEM
    remote: https://rubygems.org/
    specs:
        rack (1.6.4)
        rack-protection (1.5.3)
            rack
        sinatra (1.4.6)
            rack (~> 1.4)
            rack-protection (~> 1.4)
            tilt (>= 1.3, < 3)
        tilt (2.0.1)

PLATFORMS
    ruby

DEPENDENCIES
    sinatra (= 1.4.6)

BUNDLED WITH
    1.10.6

* config.ru *

require './app.rb'
run Sinatra::Application

* app.rb *

require 'bundler/setup'
require 'sinatra'

get '/' do
    'hello world'
end

I'm using the default Nginx folder for the app. I was able to execute the following test in config.ru:

app = proc do |env|
    [200, { "Content-Type" => "text/html" }, ["hello world"]]
end

But as soon I try to switch to Sinatra I get the error above.

Thanks in advance!

---

Ok I found the problem.

I followed the installation instruction here: https://www.phusionpassenger.com/library/install/nginx/install/oss/trusty/

But since I'm using rvm I had to change the passenger_ruby directive to point to the rvm wrapper: /usr/local/rvm/wrappers/ruby-2.1.6/ruby

---

Problem is here:

rack (1.6.4)
...
        sinatra (1.4.6)
            rack (~> 1.4)

You have a conflict in the rack version. you want both 1.6.4 and 1.4.x
How did rack 1.6.4 end up in the gemfile.lock?

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