title: No Retrofit annotation found. (parameter #1)
body: <p>I want get RSS code from a URL with <code>Retrofit</code> and if I enter url staticly in the get annotation everything is OK but with dynamic url I get an error.</p>
  
  <p>My interface service :</p>
  
  <pre><code>public interface AllNewsService {
  @GET("/fa/rss/{url}")
  void getRss( @Path("url") String nGroup ,  Callback&lt;AllNewsRss&gt; callback);}
  </code></pre>
  
  <p>And calling getRss method :</p>
  
  <pre><code>DataGetter dg = new DataGetter();
      dg.get().getRss("allnews" ,new Callback&lt;AllNewsRss&gt;() {
          @Override
          public void success(AllNewsRss allNewsRss, Response response) {
              Log.d(TAG,"success");
          }
  
          @Override
          public void failure(RetrofitError error) {
              Log.d("*********",error.toString());
          }
  </code></pre>
  
  <p>I get the following error:</p>
  
  <pre><code>retrofit.RetrofitError: AllNewsService.getRss: No Retrofit annotation found. (parameter #1)
  </code></pre>
  
  <p><strong>Note:</strong> I added below line to <code>proguard.cfg</code> but it didn't work</p>
  
  <pre><code>-keep class retrofit.** { *; }
  </code></pre>