Cannot read property id of null

[Samaalir]

hi @tmcgee , I followed the instructions but did not work and I got this error:

init.js:113 TypeError: Cannot read property 'id' of null
    at Object.a.get (init.js:200)
    at Object.constructor (init.js:553)
    at new <anonymous> (init.js:161)
    at Object.createMap (_MapMixin.js:59)
    at Object.initMapAsync (_MapMixin.js:40)
    at init.js:63
    at n (init.js:107)
    at d.then.a.then (init.js:110)
    at Object.startup (_MapMixin.js:33)
    at Object.<anonymous> (_ControllerBase.js:58) "TypeError: Cannot read property 'id' of null

[Samaalir]

If anyone got this error must add this inside the viwer.js

layout: {
            map: 'mapViewDiv'
        },