I reported this error today myself.
The issue is the package.json defines
"@angular/flex-layout": "^2.0.0-beta.12"
They accidentally released a rc version which is picked in favor of other versions and it is an older version that prevents npm serve from starting.
This needs to be "@angular/flex-layout": "2.0.0-beta.12"
or it can be "@angular/flex-layout": "^5.0.0-beta.13" which is the next release which now works when using the ^ notation since the major version number changed.
I reported this error today myself.
The issue is the package.json defines
"@angular/flex-layout": "^2.0.0-beta.12"
They accidentally released a rc version which is picked in favor of other versions and it is an older version that prevents npm serve from starting.
This needs to be "@angular/flex-layout": "2.0.0-beta.12"
or it can be "@angular/flex-layout": "^5.0.0-beta.13" which is the next release which now works when using the ^ notation since the major version number changed.
Eben Monney and Janick Ross have reacted to this post.