```ruby
require 'spec_helper'
require 'awesome_print'
require 'rspec_api_documentation/dsl'
require 'acceptance_helper'

resource 'Registrations' do
  header "Accept", "application/json"
  header "Content-Type", "application/json"
  header "Accept", "application/json"


  post '/api/v1/users' do
    parameter :email, 'Email of the new user', 'Type': 'String'
    parameter :password, 'Password of at least 8 characters', 'Type': 'String'

    response_field :id, 'Id of the new created user', scope: :data,'Type': 'Number'
    response_field :email, 'Email of the new user', scope: :data,'Type': 'String'


    #request
    let(:email) { 'danny@forestguardian.org' }
    let(:password) { 'secret_pass' }

    let(:raw_post) { params.to_json }

    example_request 'Sign in succesfully with an HTTP 200' do

      #response
      user = JSON.parse(response_body)

      expect(status).to eq(200)
      expect(user['data']['email']).to eq(email)

    end

  end

end
```

Change double to single quoted.
user
```ruby
require 'spec_helper'
require 'awesome_print'
require 'rspec_api_documentation/dsl'
require 'acceptance_helper'

resource 'Registrations' do
  header 'Accept', 'application/json'
  header 'Content-Type', 'application/json'
  header 'Accept', 'application/json'


  post '/api/v1/users' do
    parameter :email, 'Email of the new user', 'Type': 'String'
    parameter :password, 'Password of at least 8 characters', 'Type': 'String'

    response_field :id, 'Id of the new created user', scope: :data,'Type': 'Number'
    response_field :email, 'Email of the new user', scope: :data,'Type': 'String'


    #request
    let(:email) { 'danny@forestguardian.org' }
    let(:password) { 'secret_pass' }

    let(:raw_post) { params.to_json }

    example_request 'Sign in succesfully with an HTTP 200' do

      #response
      user = JSON.parse(response_body)

      expect(status).to eq(200)
      expect(user['data']['email']).to eq(email)

    end

  end

end
```
assistant