// java.lang.RuntimeException: An error occurred while executing doInBackground()
// at android.os.AsyncTask$3.done(AsyncTask.java:309)
// at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:354)
// at java.util.concurrent.FutureTask.setException(FutureTask.java:223)
// at java.util.concurrent.FutureTask.run(FutureTask.java:242)
// at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:234)
// at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
// at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
// at java.lang.Thread.run(Thread.java:818)
// Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean android.graphics.Bitmap.compress(android.graphics.Bitmap$CompressFormat, int, java.io.OutputStream)' on a null object reference
// at android.app.WallpaperManager.setBitmap(WallpaperManager.java:778)
// at droids1.prasad.des.design.util.WallpaperImageWorker.doInBackground(WallpaperImageWorker.java:40)
// at droids1.prasad.des.design.util.WallpaperImageWorker.doInBackground(WallpaperImageWorker.java:11)
// at android.os.AsyncTask$2.call(AsyncTask.java:295)
// at java.util.concurrent.FutureTask.run(FutureTask.java:237)
// ... 4 more