Android : Facebook extended read permission

When I try extend user permissions, the first time that the popup appears, I hit 'cancel' and then I continue playing with the app. The second time that the popup appears in the same session, I hit over 'Accept', but I get this java error:

07-14 22:15:06.425: E/AndroidRuntime(1226): java.lang.UnsupportedOperationException: Session: an attempt was made to request new permissions for a session that has a pending request.

07-14 22:15:06.425: E/AndroidRuntime(1226): at com.facebook.Session.requestNewPermissions(Session.java:968)

07-14 22:15:06.425: E/AndroidRuntime(1226): at com.facebook.Session.requestNewPublishPermissions(Session.java:501)

Anyone knows that could be happening?

I'm using this code

final Session mCurrentSession = Session.getActiveSession();
        Request request = Request.newGraphPathRequest(mCurrentSession,
                "me/permissions", new Request.Callback() {

                    @Override
                    public void onCompleted(Response response) {
                        // TODO Auto-generated method stub

                        GraphObject object = response.getGraphObject();

                        // Log.v("PERMISSIONS", object.getInnerJSONObject()
                        // .toString());

                        try {
                            if (object != null) {
                                JSONObject jObject = new JSONObject(object
                                        .getInnerJSONObject().toString());
                                JSONArray jArray = jObject.getJSONArray("data");
                                JSONObject jObject1 = jArray.getJSONObject(0);
                                Log.d("XMPP", ""+jObject1);
                                String per = jObject1.getString("xmpp_login");
                            }
                        } catch (JSONException e) {
                            // TODO Auto-generated catch block
                            e.printStackTrace();

                            try {
                                Session.NewPermissionsRequest request = new Session.NewPermissionsRequest(
                                        CommentsAC.this,
                                        Arrays.asList("xmpp_login"));
                                mCurrentSession
                                        .requestNewPublishPermissions(request);
                            } catch (Exception ex) {
                                ex.printStackTrace();
                            }

                        }

                    }
                });
        Request.executeBatchAsync(request);