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https://stackoverflow.com/questions/25274471/facebook-login-nullpointerexception
https://github.com/facebook/facebook-sdk-for-unity/issues/18
https://github.com/Wizcorp/phonegap-facebook-plugin/issues/357
https://forums.xamarin.com/discussion/60507/nullpointerexception-with-facebook-sdk-android
https://www.facebook.com/NullPointerException-32755211158/
https://forums.androidcentral.com/ask-question/658690-im-getting-exception-error-when-logging-into-facebook-after-deleting-some-apps.html
https://www.portalgsti.com.br/2017/02/javalangnullpointerexception-nullpointerexception-a-excecao-mais-famosa-do-java.html
http://qtpselenium.com/selenium-tutorial/forum/viewtopic.php?f=20&t=1124
https://forum.ionicframework.com/t/facebook-plugin-nullpointerexception/5102
http://qaru.site/questions/615209/facebook-login-nullpointerexception
https://support.backendless.com/t/facebook-login-fails-callbackmanager-becomes-null-after-calling-loginwithfacebooksdk/4211
https://facebook.github.io/php-webdriver/master/NullPointerException.html
http://www-01.ibm.com/support/docview.wss?uid=swg1PH02129