Error at Line 31 but, I don't see anything wrong and now nothing done in app.js works at the end of this

//Problem: No user interaction casues no change to application
//Solution: When user interacts causes changes appropriatly
var color = $('.selected').css('background-color');


//When clicking on control list item
$('.controls li').click(function(){
  $(this).siblings().removeClass('selected');
  //deselect sibling elements
  //select element
  $(this).addClass('selected');
   color = $(this).css('background-color');


//When new color is pressed 
$('#revealColorSelect').click(function(){
   //Show color select or hide the color select
  changeColor();
  $('#colorSelect').toggle();
});

//update the New color
function changeColor() {
  var r = $('#red').val();  
  var g = $('#green').val();
  var b = $('#blue').val();
  $('#newColor').css("background-color", "rgb(" + r + "," + g + "," + b + ")");
}

//When color sliders change
$("input[type=range]").change(changeColor);

//When add color is pressed
  //Append the color to the controls ul
  //Select the new color 

//On mouse events on the canvas
  //Draw lines