edit_spec.rb Failure/Error: click_button "Update Todo list" (unable to open database file)

    require 'spec_helper'

    describe "Editing todo lists" do
       it "updates a todo list successfully with correct information" do
         todo_list = TodoList.create(title: "Groceries", description: "Grocery List.")

         visit "/todo_lists"
         within "#todo_list_#{todo_list.id}" do
           click_link "Edit"
         end

         fill_in "Title", with: "New title"
         fill_in "Description", with: "New description"
         click_button "Update Todo list"

         todo_list.reload

         expect(page).to have_content("Todo list was successfully updated")
         expect(todo_list.title).to eq("New title")
         expect(todo_list.description).to eq("New description")
      end
    end

    class TodoListsController < ApplicationController
      before_action :set_todo_list, only: [:show, :edit, :update, :destroy]

      # GET /todo_lists
      # GET /todo_lists.json
      def index
        @todo_lists = TodoList.all
      end

      # GET /todo_lists/1
      # GET /todo_lists/1.json
      def show
      end

     # GET /todo_lists/new
      def new
         @todo_list = TodoList.new
      end

      # GET /todo_lists/1/edit
      def edit
      end

      # POST /todo_lists
      # POST /todo_lists.json
      def create
        @todo_list = TodoList.new(todo_list_params)

        respond_to do |format|
          if @todo_list.save
            format.html { redirect_to @todo_list, notice: 'Todo list was successfully created.' }
            format.json { render :show, status: :created, location: @todo_list }
          else
             format.html { render :new }
             format.json { render json: @todo_list.errors, status: :unprocessable_entity }
          end
        end
      end

      # PATCH/PUT /todo_lists/1
      # PATCH/PUT /todo_lists/1.json
      def update
        respond_to do |format|
        if @todo_list.update(todo_list_params)
            format.html { redirect_to @todo_list, notice: 'Todo list was successfully updated.' }
            format.json { render :show, status: :ok, location: @todo_list }
          else
            format.html { render :edit }
            format.json { render json: @todo_list.errors, status: :unprocessable_entity }
          end
        end
      end

      # DELETE /todo_lists/1
      # DELETE /todo_lists/1.json
      def destroy
        @todo_list.destroy
        respond_to do |format|
          format.html { redirect_to todo_lists_url, notice: 'Todo list was successfully destroyed.' }
          format.json { head :no_content }
        end
      end

      private
        # Use callbacks to share common setup or constraints between actions.
        def set_todo_list
         @todo_list = TodoList.find(params[:id])
        end

        # Never trust parameters from the scary internet, only allow the white list through.
        def todo_list_params
          params.require(:todo_list).permit(:title, :description)
        end
    end