TwitterSession get null


#1
  TwitterSession session = TwitterCore.getInstance().getSessionManager().getActiveSession();

I try to login with twitter account and I get token. Then I upload it to my back-end. But after I clear my cache I do not want to make user login with twitter again. Thus I just got token from my back-end. However, I cannot get session anymore. Is there any solution for me to get session with token from my back-end?