title: Unable to unmarshall response (Missing type parameter.). Response Code: 200, Response Text: OK
body: <p>I am trying to make an app on Android.
  When I set minifyEnabled to true, I get this error :</p>
  
  <pre><code>E/Lex: InteractiveVoiceViewAdapter: Interaction error                                               
  com.amazonaws.AmazonClientException: Unable to unmarshall response (Missing type parameter.). Response Code: 200, Response Text: OK
                                                      at com.amazonaws.http.AmazonHttpClient.handleResponse(Unknown Source)
                                                      at com.amazonaws.http.AmazonHttpClient.executeHelper(Unknown Source)
                                                      at com.amazonaws.http.AmazonHttpClient.execute(Unknown Source)
                                                      at com.amazonaws.services.lexrts.AmazonLexRuntimeClient.invoke(Unknown Source)
                                                      at com.amazonaws.services.lexrts.AmazonLexRuntimeClient.postContent(Unknown Source)
                                                      at com.amazonaws.mobileconnectors.lex.interactionkit.InteractionClient$2.run(Unknown Source)
                                                      at java.lang.Thread.run(Thread.java:818)
                                                   Caused by: java.lang.RuntimeException: Missing type parameter.
                                                      at com.b.c.c.a.getSuperclassTypeParameter(Unknown Source)
                                                      at com.b.c.c.a.&lt;init&gt;(Unknown Source)
                                                      at com.amazonaws.services.lexrts.model.transform.PostContentResultJsonUnmarshaller$1.&lt;init&gt;(Unknown Source)
                                                      at com.amazonaws.services.lexrts.model.transform.PostContentResultJsonUnmarshaller.unmarshall(Unknown Source)
                                                      at com.amazonaws.services.lexrts.model.transform.PostContentResultJsonUnmarshaller.unmarshall(Unknown Source)
                                                      at com.amazonaws.http.JsonResponseHandler.handle(Unknown Source)
                                                      at com.amazonaws.http.JsonResponseHandler.handle(Unknown Source)
  </code></pre>
  
  <p>How to fix this? It works fine when minify is set to false.</p>