title: Proguard with AWS (amazon service sdk) reutrn error code 1
body: <p>Here is how I edit the proguard.txt. Are there any other thing I need to do before export the apk? As it return error code 1 now in proguard.</p>
  
  <pre><code>-keep class com.facebook.** { *; }
  -keep public class com.google.** { *; }
  -keep class org.apache.commons.logging.**               { *; }
  -keep class com.amazonaws.services.sqs.QueueUrlHandler  { *; }
  -keep class com.amazonaws.javax.xml.transform.sax.*     { public *; }
  -keep class com.amazonaws.javax.xml.stream.**           { *; }
  -keep class com.amazonaws.services.**.model.*Exception* { *; }
  -keep class org.codehaus.**                             { *; }
  -keepattributes Signature,*Annotation*
  
  -dontwarn javax.xml.stream.events.**
  -dontwarn org.codehaus.jackson.**
  -dontwarn org.apache.commons.logging.impl.**
  -dontwarn org.apache.http.conn.scheme.**
  -dontwarn com.amazonaws.services.securitytoken.**
  </code></pre>
  
  <p>Here is the error</p>
  
  <pre><code>    [2014-07-08 18:43:49 - TuenmunTravel] Proguard returned with error code 1. See console
  [2014-07-08 18:43:49 - TuenmunTravel] Note: there were 1 duplicate class definitions.
  [2014-07-08 18:43:49 - TuenmunTravel]       (http://proguard.sourceforge.net/manual/troubleshooting.html#duplicateclass)
  [2014-07-08 18:43:49 - TuenmunTravel] Warning: com.amazonaws.AmazonWebServiceRequest: can't find referenced class org.apache.http.annotation.NotThreadSafe
  [2014-07-08 18:43:49 - TuenmunTravel] Warning: com.amazonaws.ClientConfiguration: can't find referenced class org.apache.http.annotation.NotThreadSafe
  [2014-07-08 18:43:49 - TuenmunTravel] Warning: com.amazonaws.DefaultRequest: can't find referenced class org.apache.http.annotation.NotThreadSafe
  [2014-07-08 18:43:49 - TuenmunTravel] Warning: com.amazonaws.RequestClientOptions: can't find referenced class org.apache.http.annotation.NotThreadSafe
  [2014-07-08 18:43:49 - TuenmunTravel] Warning: com.amazonaws.auth.STSAssumeRoleSessionCredentialsProvider: can't find referenced class com.amazonaws.services.securitytoken.AWSSecurityTokenServiceClient
  [2014-07-08 18:43:49 - TuenmunTravel] Warning: com.amazonaws.auth.STSAssumeRoleSessionCredentialsProvider: can't find referenced class com.amazonaws.services.securitytoken.AWSSecurityTokenServiceClient
  [2014-07-08 18:43:49 - TuenmunTravel] Warning: com.amazonaws.auth.STSAssumeRoleSessionCredentialsProvider: can't find referenced class com.amazonaws.services.securitytoken.AWSSecurityTokenServiceClient
  </code></pre>
  
  <p>Thanks for helping</p>