title: throw exception sinch java.lang.NoClassDefFoundError
body: <p>I was trying to run the sample code from the sdk but I got the java.lang.NoClassDefFoundError, at the line:</p>
  
  <pre><code>sinchClient = Sinch.getSinchClientBuilder()
          .context(this)
          .userId("a")
          .applicationKey("key")
          .applicationSecret("secret")
          .environmentHost("sandbox.sinch.com")
          .build();
  </code></pre>