uninitialized constant Refinery::Application (NameError)

[infousmanidrees]

getting this:

uninitialized constant Refinery::Application (NameError)

after installing refinerycms-blog gem

gemfile:

source 'https://rubygems.org'
git_source(:github) { |repo| "https://github.com/#{repo}.git" }
ruby '2.6.5'
# Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
gem 'rails', '~> 6.0.2', '>= 6.0.2.2'
# Use postgresql as the database for Active Record
gem 'pg', '>= 0.18', '< 2.0'
# Use Puma as the app server
gem 'puma', '~> 3.11'
# Use SCSS for stylesheets
gem 'sass-rails', '~> 5.0'
# Use Uglifier as compressor for JavaScript assets
gem 'uglifier', '>= 1.3.0'
# See https://github.com/rails/execjs#readme for more supported runtimes
# gem 'mini_racer', platforms: :ruby
# Use CoffeeScript for .coffee assets and views
gem 'coffee-rails' #, '~> 4.2'
# Turbolinks makes navigating your web application faster. Read more: https://github.com/turbolinks/turbolinks
gem 'turbolinks', '~> 5'
# Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
gem 'jbuilder', '~> 2.5'
# Use Redis adapter to run Action Cable in production
# gem 'redis', '~> 4.0'
# Use ActiveModel has_secure_password
# gem 'bcrypt', '~> 3.1.7'
# Use ActiveStorage variant
# gem 'mini_magick', '~> 4.8'
# Use Capistrano for deployment
# gem 'capistrano-rails', group: :development
# Reduces boot times through caching; required in config/boot.rb
gem 'bootsnap', '>= 1.1.0', require: false
group :development, :test do
  # Call 'byebug' anywhere in the code to stop execution and get a debugger console
  gem 'byebug', platforms: [:mri, :mingw, :x64_mingw]
end
group :development do
  # Access an interactive console on exception pages or by calling 'console' anywhere in the code.
  gem 'web-console', '>= 3.3.0'
  # Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring
  gem 'spring'
  gem 'spring-watcher-listen', '~> 2.0.0'
end
group :test do
  # Adds support for Capybara system testing and selenium driver
  # gem 'capybara', '>= 2.15'
  # gem 'selenium-webdriver'
  # Easy installation and use of chromedriver to run system tests with Chrome
  # gem 'chromedriver-helper'
end
gem 'bootstrap', '~> 4.1.3'
gem 'bootstrap4-datetime-picker-rails'
gem 'font-awesome-rails'
gem 'jquery-rails'
gem 'jquery-ui-rails'
gem 'kaminari', '0.17.0'
gem 'parsley-rails'
gem "recaptcha", require: "recaptcha/rails"
# Windows does not include zoneinfo files, so bundle the tzinfo-data gem
gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]
gem 'refinerycms', github: 'refinery/refinerycms', branch: 'master'
gem 'refinerycms-authentication-devise', github: 'refinery/refinerycms-authentication-devise', branch: 'master'
gem 'refinerycms-settings'
gem 'refinerycms-blog' #, git: 'https://github.com/refinery/refinerycms-blog', branch: 'master'
#gem 'refinerycms-blog' #, git: 'https://github.com/refinery/refinerycms-blog', branch: 'master'
#gem 'refinerycms-page-images'
#gem 'refinerycms-blog'  , '># 3.0.2'