console sinatra errors

gistfile1.txt

console:

gem install bundler 

rbenv local 2.2.2

bundle install 

$ postgres -D /usr/local/var/postgres
FATAL:  lock file "postmaster.pid" already exists
HINT:  Is another postmaster (PID 22858) running in data directory "/usr/local/var/postgres"?

Jack Howard (make-walks *) ~/jackhowa/two-phase/two-week/jacksrabbits
$ kill -9 22858

gemfile: 
source 'https://rubygems.org'
ruby '~> 2.2', '>= 2.2.2'

# PostgreSQL driver
gem 'pg', '~> 0.18'

# Sinatra driver
gem 'sinatra', '~> 1.4.8'
gem 'sinatra-contrib'

gem 'activerecord', '~> 5.0'
gem 'activesupport', '~> 5.0'

gem 'rake', '~> 12.0.0'

gem 'shotgun'
gem 'bcrypt'

group :test do
  gem 'shoulda-matchers'
  gem 'rack-test'
  gem 'rspec', '~> 3.5'
  gem 'capybara'
end

group :test, :development do
  gem 'factory_girl'
  gem 'faker', '~> 1.7.3'
end


authenticate: 
controller: 

get '/users/new' do
  erb :"/users/new"
end

post '/new' do
 @new_user = User.new(user_name: params[:user_name],  password: params[:password])
  if @new_user.save
    session[:user_id] = @new_user.id
    redirect "/users"
  else
    @errors = @new_user.errors.full_messages
    erb :'/users/new'
  end
end

get '/users/login' do
  erb :'/users/login'
end

post '/users' do
  @user = User.find_by(user_name: params[:user_name])

  if @user
    if @user.authenticate(@user.user_name, params[:password])
      session[:user_id] = @user.id
      redirect "/users"
    else
      @errors = ["Your valid username does have a valid password"]
      erb :"/users/login"
    end
  else
    @errors = ["Your valid username does have a valid password"]
    erb :"/users/login"
  end
end

get '/logout' do
  session.delete(:user_id)
  redirect '/users'
end