title: Caused by: java.lang.NoSuchFieldError: com.squareup.okhttp.internal.http.HttpMethod.METHODS when I using retrofit
body: <pre><code>my post request 
  
  @POST("/users/login-facebook")
  @FormUrlEncoded
  void loginFaceboook(@Field("token") String accessToken, @Field("fbId") String facebookId, @Field("platform") int platform,
  
                      Callback&lt;LoginSignupResponse&gt; callback)
  </code></pre>
  
  <p>my gradle</p>
  
  <pre><code>   compile 'com.squareup.okhttp:okhttp:2.0.0'
  compile 'com.squareup.okhttp:okhttp-urlconnection:2.0.0'
   compile 'com.squareup.retrofit:retrofit:1.6.1'
  </code></pre>
  
  <p>also my all post services have an same error</p>