start button doesn't work. Current error is 'TypeError: this.activePlayers is undefined' -> what's the next steps...

class Game {
    constructor() {
        this.board = new Board();
        this.players = this.createPlayers();
        this.ready = false;
    }
    get activePlayers() {
        return this.players.find(player => player.active);
    }
    /** 
 * Creates two player objects
 * @return  {Array}    An array of two Player objects.
 */
    createPlayers() {
        const players = [new Player('Player 1', 1, '#e15258', true),
                         new Player('Player 2', 2, '#e59a13')];
        return players;
    }

    /* Get's game ready for play
    */

    startGame(){
/** 
 * Initializes game. 
 */
        this.board.drawHTMLBoard();
        this.activePlayers.activeToken.drawHTMLToken();
        this.ready = true;
    }

}