Exception

java.lang.RuntimeException: An error occured while executing doInBackground()
    at android.os.AsyncTask$3.done(AsyncTask.java:304)
    at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
    at java.util.concurrent.FutureTask.setException(FutureTask.java:222)
    at java.util.concurrent.FutureTask.run(FutureTask.java:242)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
    at java.lang.Thread.run(Thread.java:818)
Caused by: java.lang.NullPointerException: Attempt to invoke interface method 'void ajq.previewChapter(agj, afa, boolean)' on a null object reference
    at net.android.mdm.activity.SimpleOnlineReaderActivity$c.doInBackground(SimpleOnlineReaderActivity.java:767)
    at net.android.mdm.activity.SimpleOnlineReaderActivity$c.doInBackground(SimpleOnlineReaderActivity.java:731)
    at android.os.AsyncTask$2.call(AsyncTask.java:292)
    at java.util.concurrent.FutureTask.run(FutureTask.java:237)
    ... 3 more
java.lang.NullPointerException: Attempt to invoke interface method 'void ajq.previewChapter(agj, afa, boolean)' on a null object reference
    at net.android.mdm.activity.SimpleOnlineReaderActivity$c.doInBackground(SimpleOnlineReaderActivity.java:767)
    at net.android.mdm.activity.SimpleOnlineReaderActivity$c.doInBackground(SimpleOnlineReaderActivity.java:731)
    at android.os.AsyncTask$2.call(AsyncTask.java:292)
    at java.util.concurrent.FutureTask.run(FutureTask.java:237)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
    at java.lang.Thread.run(Thread.java:818)
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