java.lang.RuntimeException: An error occurred while executing doInBackground()        at android.os.AsyncTask$3.done(AsyncTask.java:325)        at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:354)        at java.util.concurrent.FutureTask.setException(FutureTask.java:223)        at java.util.concurrent.FutureTask.run(FutureTask.java:242)        at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:243)        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133)        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)        at java.lang.Thread.run(Thread.java:760)Caused by: java.lang.NullPointerException: Attempt to invoke interface method 'java.util.Iterator java.util.List.iterator()' on a null object reference        at cat.dcat.util.d.f(Helper.java:150)        at cat.dcat.roothide.RHV2Daemon.e(RHV2Daemon.kt:42)        at cat.dcat.util.d.f(Helper.java:405)        at cat.dcat.roothide.ui.MainActivity$b.a(MainActivity.java:293)        at cat.dcat.roothide.ui.MainActivity$b.doInBackground(MainActivity.java:269)        at android.os.AsyncTask$2.call(AsyncTask.java:305)        at java.util.concurrent.FutureTask.run(FutureTask.java:237)        ... 4 more