hi I recently started learning processing..
I'm having some trouble making my program run
Could anyone tell me how I would make it run properly..basically trying to generate a randomly colored circle that follows the mouse.
thanks in advance.

1. void setup(){
     size(200,200);
     myCreation = new Creation();
   }
   
   class Creation {
     colour r;
     int xpos;
     int ypos;
   
     Creation() {
       r = random(colour(255));
       xpos = mouseX;
       ypos = mouseY;
     }
   
       void display() {
         fill(r);
         ellipse(xpos, ypos, 20, 10);
       }
     }
     //end class
   
     //making and using class
     Creation myCreation;          //declare variable to hold creation object
     void start() {
       myCreation = new Creation();   //make new creation object
     }
   
     void draw() {
       myCreation.display();
     }