Caused by: java.util.ConcurrentModificationException: No outside changes to a Realm is allowed while iterating a RealmResults. Use iterators methods instead.            at io.realm.RealmResults.assertRealmIsStable(RealmResults.java:405)            at io.realm.RealmResults.access$200(RealmResults.java:44)            at io.realm.RealmResults$RealmResultsIterator.hasNext(RealmResults.java:422)            at com.coachesdirectory.coach.db.RealmHelper$5.doInBackground(RealmHelper.java:360)            at com.coachesdirectory.coach.db.RealmHelper$5.doInBackground(RealmHelper.java:347)            at android.os.AsyncTask$2.call(AsyncTask.java:288)            at java.util.concurrent.FutureTask.run(FutureTask.java:237)            at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)            at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)            at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)            at java.lang.Thread.run(Thread.java:818)

****AsyncTask*****List<SchoolResult> favoriteSchools = params[0];Realm realm = Realm.getInstance(context);realm.beginTransaction();// Set all schools to removeRealmResults<RealmSchoolResult> markToRemove = realm.where(RealmSchoolResult.class)                        .equalTo("userAccountId", userId)                        .findAll();Iterator<RealmSchoolResult> schoolResultIterator = markToRemove.iterator();while (schoolResultIterator.hasNext()) { // Crash at this line  RealmSchoolResult realmSchoolResult = schoolResultIterator.next();  realmSchoolResult.setNeedRemove(true);}