NPE on MainActivity startup

2022-04-18 21:48:41.987 15840-15840/com.amaze.filemanager.debug E/MainActivity: Error setting up DataUtils
    java.lang.NullPointerException: Can't toast on a thread that has not called Looper.prepare()
        at com.android.internal.util.Preconditions.checkNotNull(Preconditions.java:157)
        at android.widget.Toast.getLooper(Toast.java:179)
        at android.widget.Toast.<init>(Toast.java:164)
        at android.widget.Toast.makeText(Toast.java:492)
        at android.widget.Toast.makeText(Toast.java:480)
        at com.amaze.filemanager.database.UtilsHandler.getSmbList(UtilsHandler.kt:292)
        at com.amaze.filemanager.ui.activities.MainActivity.lambda$onCreate$0$com-amaze-filemanager-ui-activities-MainActivity(MainActivity.java:383)
        at com.amaze.filemanager.ui.activities.MainActivity$$ExternalSyntheticLambda10.run(Unknown Source:2)
        at io.reactivex.internal.operators.completable.CompletableFromRunnable.subscribeActual(CompletableFromRunnable.java:36)
        at io.reactivex.Completable.subscribe(Completable.java:2309)
        at io.reactivex.internal.operators.completable.CompletableSubscribeOn$SubscribeOnObserver.run(CompletableSubscribeOn.java:64)
        at io.reactivex.Scheduler$DisposeTask.run(Scheduler.java:578)
        at io.reactivex.internal.schedulers.ScheduledRunnable.run(ScheduledRunnable.java:66)
        at io.reactivex.internal.schedulers.ScheduledRunnable.call(ScheduledRunnable.java:57)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:301)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
        at java.lang.Thread.run(Thread.java:923)

Start with UtilsHandler.kt at line 292 and MainActivity.java at line 383, then trace how the startup task is scheduled through the RxJava stack. Confirm the startup path no longer raises the reported Toast/Looper exception and that DataUtils setup completes without the NPE.