title: Nest can't resolve dependencies
body: <p>Can't figure out what's wrong with my code. Reviewing what error describes; I find things alright.</p>
  
  <p>Running <code>npm start</code> console says:</p>
  
  <blockquote>
    <p>Nest can't resolve dependencies of the DescribeService
    (UrlsAfipService, WsaaService, ?). Please make sure that the argument
    at index [2] is available in the ApiModule context.</p>
  </blockquote>
  
  <p><strong>DescribeService</strong></p>
  
  <pre><code>import { Injectable } from '@nestjs/common';
  import { UrlsAfipService } from './urls-afip.service'
  import { WsaaService } from './wsaa.service'
  import * as soap from 'soap';
  
  @Injectable()
  export class DescribeService {
  
    constructor (
      private readonly urlsAfipService: UrlsAfipService,
      private readonly wsaaService: WsaaService,
      private clients: object
    ) {}
  
    private createClientForService(service: string): Promise&lt;any&gt; {
      return new Promise((resolve, reject) =&gt; {
        if (this.clients[service]) {
          resolve(this.clients[service])
        } else {
          soap.createClient(this.urlsAfipService.getService(service), (err, client) =&gt; {
            if (err &amp;&amp; !client) {
              reject(err)
            } else {
              this.clients[service] = client;
              resolve(client);
            }
          })
        }
      })
    }
  
    describe(service) {
          this.wsaaService.generateToken(service).then((tokens) =&gt; {
  
              this.createClientForService(service).then((client) =&gt; {
                  return client.describe()
              });
  
          }).catch((err) =&gt; {
              return err.message
          })
    }
  
  }
  </code></pre>
  
  <p><strong>ApiModule</strong></p>
  
  <pre><code>import { Module } from '@nestjs/common';
  import { ConfigModule } from '../config/config.module';
  import { ApiController } from './api.controller';
  import { UrlsAfipService } from './urls-afip.service'
  import { WsaaService } from './wsaa.service'
  import { DescribeService } from './describe.service';
  
  @Module({
    controllers: [ApiController],
    providers: [UrlsAfipService, WsaaService, DescribeService],
    imports: [ConfigModule]
  })
  
  export class ApiModule {}
  </code></pre>