parameter 1 is not of type 'Node'.

// Problem: User interaction doesn't provide desired results.
// Solution: Add interactivity so the user can manage daily tasks.

let taskInput = document.getElementById('newtask');//new-task
let addButton = document.getElementsByTagName('button')[0]; //first button
let incompleteTasksholder = document.getElementById('incomplete-tasks');
let completedTasksholder = document.getElementById('completed-tasks');

//Add a new task


let addTask = function mything() {

  //When the button is pressed
  //Create a new list item with the text from #new-task:


  let newTask = document.createElement("li");
    return newTask;
  incompleteTasksholder.appendChild('newTask');
  //input (Checkbox)

    //label
    //input (texts)
    //button.edit
    //button.delete
    //Each elements, need modified and appended

}