NestJS Nest can't resolve dependencies of the UserService (?, SettingsService).

When you start the APP this is the error you get, also testing with e2e will give the error too.

```
$ jest --config ./test/jest-e2e.json
FAIL test/app.e2e-spec.ts (10.787s)
AppController (e2e)
× / (GET) (252ms)

● AppController (e2e) › / (GET)

Nest can't resolve dependencies of the UserService (?, SettingsService). Please make sure that the argument UserModel at index [0] is available in the AuthModule context.

Potential solutions:
- If UserModel is a provider, is it part of the current AuthModule?
- If UserModel is exported from a separate @Module, is that module imported within AuthModule?
@Module({
imports: [ /* the Module containing UserModel */ ]
})

at Injector.lookupComponentInExports (../node_modules/@nestjs/core/injector/injector.js:185:19)
at Injector.resolveComponentInstance (../node_modules/@nestjs/core/injector/injector.js:142:33)
at resolveParam (../node_modules/@nestjs/core/injector/injector.js:96:38)
at async Promise.all (index 0)
at Injector.resolveConstructorParams (../node_modules/@nestjs/core/injector/injector.js:111:27)
at Injector.loadInstance (../node_modules/@nestjs/core/injector/injector.js:78:9)
at Injector.loadProvider (../node_modules/@nestjs/core/injector/injector.js:35:9)
at async Promise.all (index 6)
at InstanceLoader.createInstancesOfProviders (../node_modules/@nestjs/core/injector/instance-loader.js:41:9)
at ../node_modules/@nestjs/core/injector/instance-loader.js:27:13
at async Promise.all (index 3)
at InstanceLoader.createInstances (../node_modules/@nestjs/core/injector/instance-loader.js:26:9)
at InstanceLoader.createInstancesOfDependencies (../node_modules/@nestjs/core/injector/instance-loader.js:16:9)
at TestingModuleBuilder.compile (../node_modules/@nestjs/testing/testing-module.builder.js:38:9)

● AppController (e2e) › / (GET) TypeError: Cannot read property 'getHttpServer' of undefined 22 | 23 | it('/ (GET)', () => { > 24 | return request(app.getHttpServer()) | ^ 25 | .get('/') 26 | .expect(200) 27 | .expect('Hello World!'); at Object. (app.e2e-spec.ts:24:24)
```