Unexpected value 'undefined' declared by the module 'AppModule'

Question

What is wrong here? I\'m trying to make it work but I get that error in the header. I have included the in the app

Answer 1

Error in /turbo_modules/@angular/compiler@8.2.14/bundles/compiler.umd.js (2603:26) Unexpected value 'undefined' declared by the module 'AppModule'

I had the problem that export class someClassName had used an unknown/wrong class name in one of my files (copy/paste error) and has been never registered anywhere (e.g. `AppModule.ts*).