RuntimeException: Can't create handler inside thread that has not called Looper.prepare()

[lingling-fan]

//package name: in.ac.dtu.subtlenews
//version: 1.0
java.lang.RuntimeException: An error occured while executing doInBackground()
at android.os.AsyncTask$3.done(AsyncTask.java:299)
at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:352)
at java.util.concurrent.FutureTask.setException(FutureTask.java:219)
at java.util.concurrent.FutureTask.run(FutureTask.java:239)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
at java.lang.Thread.run(Thread.java:841)
Caused by: java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()
at android.os.Handler.(Handler.java:197)
at android.os.Handler.(Handler.java:111)
at android.widget.Toast$TN.(Toast.java:324)
at android.widget.Toast.(Toast.java:91)
at android.widget.Toast.makeText(Toast.java:238)
at in.ac.dtu.subtlenews.k.a(Unknown Source)
at in.ac.dtu.subtlenews.k.doInBackground(Unknown Source)
at android.os.AsyncTask$2.call(AsyncTask.java:287)
at java.util.concurrent.FutureTask.run(FutureTask.java:234)