In challenge 3, I got the following error: There is a problem with your code: .init@http://play.elevatorsaga.com/app.js http://play.elevatorsaga.com/app.js lin

In challenge 3, I got the following error: There is a problem with your code: .init@http://play.elevatorsaga.com/app.js http://play.elevatorsaga.com/app.js line 66 > eval:12:9 createWorldController/controller.start@http://play.elevatorsaga.com/world.js:185:13 http://play.elevatorsaga.com/world.js:185:13 app.startChallenge@http://play.elevatorsaga.com/app.js:175:9 http://play.elevatorsaga.com/app.js:175:9 @http://play.elevatorsaga.com/app.js:216:13 http://play.elevatorsaga.com/app.js:216:13 riot.observable/el.trigger@http://play.elevatorsaga.com/libs/riot.js:45:1 http://play.elevatorsaga.com/libs/riot.js:45:1 pop@http://play.elevatorsaga.com/libs/riot.js:89:31 http://play.elevatorsaga.com/libs/riot.js:89:31