我的Facebook登录应用程序因以下运行时错误而失败：
07-31 12:47:10.195 1309-1316/com.android.quicksearchbox E/jdwp﹕ Failed writing handshake bytes: Broken pipe (-1 of 14)
07-31 12:47:11.004 1341-1358/com.example.apurva.myapplication E/ActivityThread﹕ Failed to find provider info for com.facebook.katana.provider.AttributionIdProvider
07-31 12:47:11.094 1341-1360/com.example.apurva.myapplication E/AndroidRuntime﹕ FATAL EXCEPTION: AsyncTask #2
java.lang.RuntimeException: An error occured while executing doInBackground()
at android.os.AsyncTask$3.done(AsyncTask.java:278)
at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
at java.util.concurrent.FutureTask.run(FutureTask.java:137)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:208)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
at java.lang.Thread.run(Thread.java:856)
Caused by: java.lang.NullPointerException
at java.util.concurrent.ConcurrentHashMap.containsKey(ConcurrentHashMap.java:781)
at com.facebook.internal.Utility.queryAppSettings(Utility.java:802)
at com.facebook.login.widget.LoginButton$1.doInBackground(LoginButton.java:502)
at com.facebook.login.widget.LoginButton$1.doInBackground(LoginButton.java:499)
at android.os.AsyncTask$2.call(AsyncTask.java:264)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
at java.util.concurrent.FutureTask.run(FutureTask.java:137)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:208)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
at java.lang.Thread.run(Thread.java:856)
关于我到目前为止所做的一些指示： 1）遵循Facebook的入门帖子中的所有要求。 2）将元数据添加到XML。 3）将密钥哈希添加到Facebook
如果您看到任何可能导致问题的特定文件，并希望在回答之前看到它，请告诉我。