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Unable to start activity ComponentInfo{MyActivity}: java.lang.NullPointerException
java.lang.NullPointerException: 	at java.util.concurrent.ConcurrentHashMap.get(ConcurrentHashMap.java:767)	at com.facebook.internal.Utility.getDialogFeatureConfig(Utility.java:907)	at com.facebook.internal.DialogPresenter.getVersionSpecForFeature(DialogPresenter.java:255)	at com.facebook.internal.DialogPresenter.getProtocolVersionForNativeDialog(DialogPresenter.java:241)	at com.facebook.internal.DialogPresenter.canPresentNativeDialogWithFeature(DialogPresenter.java:75)	at com.facebook.share.widget.ShareDialog.canShowNative(ShareDialog.java:153)	at com.facebook.share.widget.ShareDialog.access$300(ShareDialog.java:56)	at com.facebook.share.widget.ShareDialog$NativeHandler.canShow(ShareDialog.java:304)	at com.facebook.share.widget.ShareDialog$NativeHandler.canShow(ShareDialog.java:275)	at com.facebook.internal.FacebookDialogBase.canShowImpl(FacebookDialogBase.java:135)	at com.facebook.internal.FacebookDialogBase.canShow(FacebookDialogBase.java:122)	at com.facebook.share.widget.ShareButtonBase.canShare(ShareButtonBase.java:160)	at com.facebook.share.widget.ShareButtonBase.setShareContent(ShareButtonBase.java:76)	at com.example.bits.fbpost.MainActivity.onCreate(MainActivity.java:103)	at android.app.Activity.performCreate(Activity.java:5008)	at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079)	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023)