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Error: Permission Denied @rb_sysopen when trying to install gem pg in my rails application (Windows 7)

Using Windows 7 to start and run cmd as an administrator.
I recently started working with ruby ​​on rails and in my new rails app. I try to install gem postgres (pg) and then get permission denied as below:

C:\wamp\www\RailsApp>bundle install
DL is deprecated, please use Fiddle
Fetching gem metadata from https://rubygems.org/...........
Using rake 10.4.2
Using i18n 0.7.0
Using json 1.8.2
Using minitest 5.5.1
Using thread_safe 0.3.4
Using tzinfo 1.2.2
Using activesupport 4.1.8
Using builder 3.2.2
Using erubis 2.7.0
Using actionview 4.1.8
Using rack 1.5.2
Using rack-test 0.6.3
Using actionpack 4.1.8
Using mime-types 2.4.3
Using mail 2.6.3
Using actionmailer 4.1.8
Using activemodel 4.1.8
Using arel 5.0.1.20140414130214
Using activerecord 4.1.8
Using coffee-script-source 1.8.0
Using execjs 2.2.2
Using coffee-script 2.3.0
Using thor 0.19.1
Using railties 4.1.8
Using coffee-rails 4.0.1
Using hike 1.2.3
Using multi_json 1.10.1
Using jbuilder 2.2.6
Using jquery-rails 3.1.2

Errno::EACCES: Permission denied @ rb_sysopen - C:/Ruby21/lib/ruby/gems/2.1.0/ge
ms/pg-0.18.1-x86-mingw32/lib/2.1/pg_ext.so
An error occurred while installing pg (0.18.1), and Bundler cannot continue.
Make sure that `gem install pg -v '0.18.1'` succeeds before bundling.

I tried

gem install pg

which leads to the same error.
However ... when I try

gem install pg -mingw32

He looks successful:

C:\wamp\www\RailsApp>gem install pg -mingw32
Fetching: pg-0.18.1-x86-mingw32.gem (100%)
Successfully installed pg-0.18.1-x86-mingw32
invalid options: -f fivefish
(invalid options are ignored)
Parsing documentation for pg-0.18.1-x86-mingw32
Installing ri documentation for pg-0.18.1-x86-mingw32
Done installing documentation for pg after 16 seconds
1 gem installed

Despite the fact that after searching for several messages, I can’t find a solution, how can I implement this using gemfile to make a sampler without errors or find a solution to the problem, why did I first get a permission denial.
> Here is my current gemfile:

source 'https://rubygems.org'


# Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
gem 'rails', '4.1.8'
# Use postgresql as the database for Active Record
gem 'pg'
# Use SCSS for stylesheets
gem 'sass-rails', '~> 4.0.3'
# Use Uglifier as compressor for JavaScript assets
gem 'uglifier', '>= 1.3.0'
# Use CoffeeScript for .js.coffee assets and views
gem 'coffee-rails', '~> 4.0.0'
# See https://github.com/sstephenson/execjs#readme for more supported runtimes
# gem 'therubyracer',  platforms: :ruby

# Use jquery as the JavaScript library
gem 'jquery-rails'
# Turbolinks makes following links in your web application faster. Read more: https://github.com/rails/turbolinks
gem 'turbolinks'
# Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
gem 'jbuilder', '~> 2.0'
# bundle exec rake doc:rails generates the API under doc/api.
gem 'sdoc', '~> 0.4.0',          group: :doc

# Use ActiveModel has_secure_password
# gem 'bcrypt', '~> 3.1.7'

# Use unicorn as the app server
# gem 'unicorn'

# Use Capistrano for deployment
# gem 'capistrano-rails', group: :development

# Use debugger
# gem 'debugger', group: [:development, :test]

# Windows does not include zoneinfo files, so bundle the tzinfo-data gem
gem 'tzinfo-data', platforms: [:mingw, :mswin]

Note. I tried to use

gem 'pg', platform: :mingw

.
, , . , .

+4
1

,

C:/Ruby21/lib/ruby/gems/2.1.0/ge
ms/pg-0.18.1-x86-mingw32/lib/2.1/

( , ) permission .

, , , - Windows . , CMD, "run as administrator". Windows.

0

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