The context argument cannot be empty on Facebook

Question

I used the facebook login button for 5 months in my application, and it works fine until today, this error appeared only today.

Stack trace:

STACK_TRACE=java.lang.NullPointerException: Argument 'context' cannot be null at com.facebook.internal.Validate.notNull(Validate.java:76) at com.facebook.internal.Utility.getMetadataApplicationId(Utility.java:594) at com.facebook.appevents.AppEventsLogger.<init>(AppEventsLogger.java:757) at com.facebook.appevents.AppEventsLogger.<init>(AppEventsLogger.java:732) at com.facebook.appevents.AppEventsLogger.newLogger(AppEventsLogger.java:400) at com.facebook.FacebookButtonBase.logButtonCreated(FacebookButtonBase.java:225) at com.facebook.FacebookButtonBase.onAttachedToWindow(FacebookButtonBase.java:136) at android.view.View.dispatchAttachedToWindow(View.java:14624) at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:2845) at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:2845) at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:2845) at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:2845) at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:2845) at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:2845) at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1395) at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1138) at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6227) at android.view.Choreographer$CallbackRecord.run(Choreographer.java:884) at android.view.Choreographer.doCallbacks(Choreographer.java:696) at android.view.Choreographer.doFrame(Choreographer.java:631) at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:870) at android.os.Handler.handleCallback(Handler.java:743) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:150) at android.app.ActivityThread.main(ActivityThread.java:5546) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:792) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:682)