Rails 4 routing error when scaffolding - ruby-on-rails

Question

After performing a rails g scaffold Project name:string, I get a routing error when I create a new project.
My steps:
1) on /projects, I click 'New Project'.
2) I fill the project details and click 'Create Project'.
In this step the form seems to be correct:
form accept-charset="UTF-8" action="/projects" class="new_project" id="new_project" method="post"
3) I get the following error (routing error): No route matches [POST] "/projects/new"
Whereas:
when I reload the /projects/new page, the creation of the project works fine
Any reason for this?

Answer 1

Below are the files I have (I created most of them with the scaffolding)
app/models/project.rb:
class Project < ActiveRecord::Base
end
app/controllers/projects_controller.rb: (I only show here the methods that we re interested in)
class ProjectsController < ApplicationController
before_filter :authenticate_user!, :except => [:show, :index]
before_action :set_project, only: [:show, :edit, :update, :destroy]
# GET /projects/new
def new
#project = Project.new
end
# GET /projects/1/edit
def edit
end
# POST /projects
# POST /projects.json
def create
#project = Project.new(project_params)
respond_to do |format|
if #project.save
format.html { redirect_to #project, notice: 'Project was successfully created.' }
format.json { render action: 'show', status: :created, location: #project }
else
format.html { render action: 'new' }
format.json { render json: #project.errors, status: :unprocessable_entity }
end
end
end
# PATCH/PUT /projects/1
# PATCH/PUT /projects/1.json
def update
respond_to do |format|
if #project.update(project_params)
format.html { redirect_to #project, notice: 'Project was successfully updated.' }
format.json { head :no_content }
else
format.html { render action: 'edit' }
format.json { render json: #project.errors, status: :unprocessable_entity }
end
end
end
private
# Use callbacks to share common setup or constraints between actions.
def set_project
#project = Project.find(params[:id])
end
# Never trust parameters from the scary internet, only allow the white list through.
def project_params
params.require(:project).permit(:name)
end
end
and config/routes.rb:
Testproject::Application.routes.draw do
devise_for :users
resources :projects
root 'projects#index'
end
Thanks for your help