title: undefined method `permit' for "1":String - RSPEC
body: <p>I fell a bit ridiculous but I really have no idea what this error is trying to tell me? I'm new to rspec and this is a new one for me. I'll post my code for clarity - ERROR: undefined method `permit' for "1":String|</p>
  
  <p>CONTROLLER:</p>
  
  <pre><code>def subscriber_params
    params.require(:subscriber).permit(:first_name, :last_name, :email, :phone_number)
  end
  </code></pre>
  
  <p>SPEC:
        require "rails_helper"</p>
  
  <pre><code>describe SubscribersController do
    include Devise::TestHelpers
  
    let(:user) { FactoryGirl.create(:user) }
    let(:subscriber) { FactoryGirl.create(:subscriber) }
  
    it "creates a new comment" do
      sign_in(user)
      comment = FactoryGirl.attributes_for(:comment)
  
      expect { post :create, subscriber: subscriber, comment: comment }.to change(Comment, :count).by(1)
    end
  end
  </code></pre>
  
  <p>ERROR: </p>
  
  <p><a href="https://i.stack.imgur.com/2I66I.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/2I66I.png" alt="enter image description here"></a></p>