This error is driving me up a wall. I have an authguard service as seen here. No matter what I do the compiler keeps giving me this error
'
Either add the @Injectable() decorator to 'AuthGuard', or configure a different provider (such as a provider with 'useFactory').
'
@Injectable({ providedIn: 'root' })
export class AuthGuard implements CanActivate {
constructor(private myService: MyService,
private router: Router)}
and I am implementing it here in my app.module
providers: [
AuthGuard
]
bootstrap: [AppComponent]
})
export class AppModule { }
I clearly have the injectable decorator above the Authguard class but I still get this error. This only happened when I upgraded from Angular 8 to 9.1 Is this a bug of some sort with VS Code or the compiler or something?
You are registering same dependency from 2 places
First is @Injectable({ providedIn: 'root' })
. You are registering with root injector with this syntax { providedIn: 'root' }
.
Second is below you are registering again, that is the reason for your error.
providers: [
AuthGuard
]
Just remove it from providers array and it will resolve your issue.
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