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java.lang.NullPointerException: 	at com.android.launcher2.LauncherModel$LoaderTask.checkItemPlacement(LauncherModel.java:1211)	at com.android.launcher2.LauncherModel$LoaderTask.loadWorkspace(LauncherModel.java:1368)	at com.android.launcher2.LauncherModel$LoaderTask.loadAndBindWorkspace(LauncherModel.java:1005)	at com.android.launcher2.LauncherModel$LoaderTask.run(LauncherModel.java:1111)	at android.os.Handler.handleCallback(Handler.java:730)	at android.os.Handler.dispatchMessage(Handler.java:92)	at android.os.Looper.loop(Looper.java:137)	at android.os.HandlerThread.run(HandlerThread.java:61)