I have this folder structure:

.
├── lib/
│   └── dma/
│       ├── modules/
│       │   └── cmts/
│       │       ├── cmts.module.ts
│       │       └── cmts.service.ts
│       └── dma.module.ts
└── src/
    ├── app.module.ts
    └── app.service.ts

And I have these 3 modules & 2 services, AppService service needs the CmtsService:

// # ~/src/app.service.ts
@Provider()
class AppService{
  constructor(private readonly cmtsService: CmtsService)
}

// # ~/src/app.module.ts
@Module({
  imports: [DmaModule],
})
class AppModule{}

// # ~/lib/dma/dma.module.ts
@Module({
  imports: [CmtsModule],
})
class DmaModule{}

// # ~/lib/dma/modules/cmts/cmts.module.ts
@Module({
  imports: [],
  providers: [CmtsService]
})
class CmtsModule{}

// # ~/lib/dma/modules/cmts/cmts.service.ts
@Provider()
class CmtsService{
}

When I run my app, I get this error:

ERROR [ExceptionHandler] Nest can’t resolve dependencies of the AppService (?). Please make sure that the argument CmtsService at index [0] is available in the AppModule context.