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An error occured while executing doInBackground()
java.lang.NullPointerException: 	at com.github.barteksc.pdfviewer.RenderingAsyncTask.proceed(RenderingAsyncTask.java:103)	at com.github.barteksc.pdfviewer.RenderingAsyncTask.doInBackground(RenderingAsyncTask.java:67)	at com.github.barteksc.pdfviewer.RenderingAsyncTask.doInBackground(RenderingAsyncTask.java:31)	at android.os.AsyncTask$2.call(AsyncTask.java:288)	at java.util.concurrent.FutureTask.run(FutureTask.java:237)