Realm exception in background thread

[1407arjun]

The error is caused in the onError callback section of the Realm.getInstanceAsync in SplashActivity.java even though the downloads are completed.

E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.tfd.ffcsez, PID: 16702
    io.realm.exceptions.RealmException: Exception happens when initializing Realm in the background thread.
        at io.realm.BaseRealm$InstanceCallback.onError(BaseRealm.java:1029)
        at io.realm.Realm$Callback.onError(Realm.java:1992)
        at com.tfd.ffcsez.SplashActivity$1$2.onError(SplashActivity.java:144)
        at io.realm.RealmCache$CreateRealmRunnable$2.run(RealmCache.java:301)
        at android.os.Handler.handleCallback(Handler.java:873)
        at android.os.Handler.dispatchMessage(Handler.java:99)
        at android.os.Looper.loop(Looper.java:214)
        at android.app.ActivityThread.main(ActivityThread.java:7078)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:494)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:964)
     Caused by: UNKNOWN(unknown:-1): Operation Canceled
        at io.realm.internal.objectstore.OsAsyncOpenTask.start(OsAsyncOpenTask.java:43)
        at io.realm.internal.SyncObjectServerFacade.downloadInitialFullRealm(SyncObjectServerFacade.java:207)
        at io.realm.internal.SyncObjectServerFacade.downloadInitialRemoteChanges(SyncObjectServerFacade.java:199)
        at io.realm.RealmCache.doCreateRealmOrGetFromCache(RealmCache.java:437)
        at io.realm.RealmCache.createRealmOrGetFromCache(RealmCache.java:412)
        at io.realm.RealmCache$CreateRealmRunnable.run(RealmCache.java:247)
        at io.realm.internal.async.BgPriorityRunnable.run(BgPriorityRunnable.java:34)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:459)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        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:764)