title: Couldn't lookup symbols error using Alamofire in Playgrounds
body: <p>I'm using Playgrounds and have Alamofire and SwiftSoup installed via Podfile. I can retrieve the HTML from the URL with <code>URLSession</code> but wish to do so with Alamofire. My code is below.</p>
  
  <pre><code>let url = "https://www.nba.com/warriors/stats"
  Alamofire.request(url, method: .post, parameters: nil, encoding: URLEncoding.default).validate(contentType: ["application/x-www-form-urlencoded"]).response { (response) in
      if let data = response.data, let _ = String(data: data, encoding: .utf8) {
          do {
              print(data)
          }
      }
  }
  </code></pre>
  
  <p>I'm not sure why I'm getting the following error. </p>
  
  <pre><code>error: Couldn't lookup symbols:
    Alamofire.DataRequest.response(queue: Swift.Optional&lt;__C.OS_dispatch_queue&gt;, completionHandler: (Alamofire.DefaultDataResponse) -&gt; ()) -&gt; Self
    protocol witness table for Alamofire.URLEncoding : Alamofire.ParameterEncoding in Alamofire
    type metadata accessor for Alamofire.DataRequest
    Alamofire.DataRequest.validate&lt;A where A: Swift.Sequence, A.Element == Swift.String&gt;(contentType: A) -&gt; Self
    Alamofire.request(_: Alamofire.URLConvertible, method: Alamofire.HTTPMethod, parameters: Swift.Optional&lt;Swift.Dictionary&lt;Swift.String, Any&gt;&gt;, encoding: Alamofire.ParameterEncoding, headers: Swift.Optional&lt;Swift.Dictionary&lt;Swift.String, Swift.String&gt;&gt;) -&gt; Alamofire.DataRequest
    protocol witness table for Swift.String : Alamofire.URLConvertible in Alamofire
    static Alamofire.URLEncoding.default.getter : Alamofire.URLEncoding
    type metadata for Alamofire.URLEncoding
  </code></pre>