User is unable to login with Facebook after app update on Android with Parse SDK -

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i using parse sdk on android device. in our app, user can login facebook.

everything works fine if user install app first time , tries login facebook. however, if user has installed , logged in app , tries update new version, app shows login screen. , when user tries login facebook again, fails , no error shown. in mainactivity (launching activity), code:

if (parseuser.getcurrentuser() == null) {      intent intent = new intent(this, loginactivity.class);      parseloginconfig config = new parseloginconfig();      config.setfacebookloginenabled(true);      intent.putextras(config.tobundle());      startactivityforresult(intent, login_request); }

loginactivity derives parseloginactivity.

any in regard appreciated.


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