Can't resolve all parameters for - angularjs

Question

I am new with Angular. I am getting an error when I am trying to create a production build (ng build --prod). The error thrown is as follow
ERROR in Can't resolve all parameters for OpcionValor in C:/Users/Usuario/Documents/global_workspace/hcdu_proyect/HCDU_FRONT/HCDU/src/app/modulos/anamesis/anamnesis.module.ts: (?, ?)
.
ERROR in ./src/main.ts
Module not found: Error: Can't resolve './$$_gendir/app/app.module.ngfactory' in 'C:\Users\Usuario\Documents\global_workspace\hcdu_proyect\HCDU_FRONT\HCDU\src'
# ./src/main.ts 4:0-74
# multi ./src/main.ts
The file anamnesis.module.ts contains the following code:
import {NgModule} from '#angular/core';
import {CommonModule} from '#angular/common';
import {OpcionComboBox, OpcionComboBoxComplex} from '../interfaces/interfaces.module'
#NgModule({
imports: [
CommonModule,
],
declarations: []
})
export class OpcionValor implements OpcionComboBox {
constructor(private nombre: string, private valor: string) {
this.nombre = nombre;
this.valor = valor;
}
getEntityValor(): string {
return this.valor;
}
setEntityValor(valor: string) {
this.valor = valor;
}
}
export class OpcionValorObservacion extends OpcionValor implements OpcionComboBoxComplex {
observacion: string;
constructor(name: string, valor: string, observacion: string) {
super(name,valor);
this.observacion = observacion;
}
getEntityObservacion(): string {
return this.observacion;
}
setEntityObservacion(observacion: string) {
this.observacion = observacion;
}
}
export interface AnamnesisInterface {
getOpcionSeleccionadaPorNombre(nombre:string):OpcionValor;
setOpcionValorPorNombre(nombre:string, valor:string);
setOpcionValorObservacionPorNombre(nombre:string, valor:string, observacion:string);
}
I am not sure why the error is thrown if I do not have that error in dev environment. Please, somebody can help me to solve this error?

Answer 1

Your module is expecting two input parameters to its constructor, both of type string. Angular does not know how to construct it, most likely. I assume somewhere you have a top-level AppModule or some equivalent which looks similar to this:
#NgModule({
imports: [ OpcionValor ],
bootstrap: [ AppComponent ]
})
export class AppModule {
}
It needs to inject an OpcionValor module but can't because it doesn't know what to pass in for the constructor parameters.
I think you may need to do a little redesigning. Should nombre and valor really be members of OpcionValor, or do they belong on a Component? Should OpcionValor even be a module, or should it actually be a Component?

Answer 2

I had solved this issue by adding the class declaration regarding the ts file name.
The module files is called anamnesis.module.ts so I had to add the following class declaration:
export class AnamnesisModule { }
So, my module code is :
File name: anamnesis.module.ts
import {NgModule} from '#angular/core';
import {CommonModule} from '#angular/common';
import {OpcionComboBox, OpcionComboBoxComplex} from '../interfaces/interfaces.module'
#NgModule({
imports: [
CommonModule
],
declarations: []
})
**export class AnamnesisModule { }**
export class OpcionValor implements OpcionComboBox {
nombre: string;
valor: string;
constructor(nombre: string, valor?: string) {
this.nombre = nombre;
this.valor = valor;
}
..................
}
export class OpcionValorObservacion extends OpcionValor implements OpcionComboBoxComplex {
observacion: string;
constructor(name: string, valor?: string, observacion?: string) {
super(name,valor);
this.observacion = observacion;
}
.........
}
I am not sure why but it is working. I suppose there is a relation between the file name and the class declaration required.