Ionic 4- Lab not working

Ionic Framework
1

Hi,

I created a new Ionic 4 project.

When I ran ionic lab, it came with:

Lab: http://localhost:8200
Local: http://localhost:8100
i.e. 8200 vs 8100.

In the Browser, however Ionic lab does not work (neither on 8200 nor 8100) and it gives the following error:

ERROR Error: Uncaught (in promise): Error: Cannot match any routes. URL Segment: 'ionic-lab'
Error: Cannot match any routes. URL Segment: 'ionic-lab'
   at Anonymous function (http://localhost:8100/vendor.js:70560:17)
   at CatchSubscriber.prototype.error (http://localhost:8100/vendor.js:86427:17)
   at Subscriber.prototype._error (http://localhost:8100/vendor.js:83166:9)
   at Subscriber.prototype.error (http://localhost:8100/vendor.js:83146:13)
   at Subscriber.prototype._error (http://localhost:8100/vendor.js:83166:9)
   at Subscriber.prototype.error (http://localhost:8100/vendor.js:83146:13)
   at Subscriber.prototype._error (http://localhost:8100/vendor.js:83166:9)
   at Subscriber.prototype.error (http://localhost:8100/vendor.js:83146:13)
   at TapSubscriber.prototype._error (http://localhost:8100/vendor.js:91160:9)
   at Subscriber.prototype.error (http://localhost:8100/vendor.js:83146:13)

I therefore got around this problem through:
mkdir www