undefined local variable or method `todo_item'?

I'm having difficulty finding where my code creates this error exactly. According to my output the trace goes back to todo_items_controller.rb and the create_spec.rb files

Failure/Error: click_button "Save" NameError: undefined local variable or method todo_item' for #<TodoItemsController:0xbac7db38> # ./app/controllers/todo_items_controller.rb:13:increate' # ./spec/features/todo_items/create_spec.rb:17:in `block (2 levels) in <top (required)>'

But I've watched the video multiple times and can't find a discrepancy in my code in my file.

class TodoItemsController < ApplicationController
  def index
    @todo_list = TodoList.find(params[:todo_list_id])
  end

  def new
    @todo_list = TodoList.find(params[:todo_list_id])
    @todo_item = @todo_list.todo_items.new
  end

  def create
    @todo_list = TodoList.find(params[:todo_list_id])
    @todo_item = @todo_list.todo_items.new(todo_item.params)
    if @todo_item.save
        flash[:success] = "Added todo list item."
        redirect_to todo_list_todo_items_path
    else
        flash[:error] = "There was a problem adding that todo list item."
        render action: :new
    end
  end

private def todo_item_params params[:todo_item].permit(:content) end end