java.util.ConcurrentModificationException:
at java.util.ArrayList$Itr.next (ArrayList.java:831)
at java.util.Collections$UnmodifiableCollection$1.next (Collections.java:1115)
at com.google.android.gms.ads.omid.library.walking.async.h.a (com.google.android.gms.policy_ads_fdr_dynamite@20290000@20290000.249178941.249178941:4)
at com.google.android.gms.ads.omid.library.walking.async.h.onPostExecute (com.google.android.gms.policy_ads_fdr_dynamite@20290000@20290000.249178941.249178941)
at android.os.AsyncTask.finish (AsyncTask.java:660)
at android.os.AsyncTask.-wrap1 (AsyncTask.java)
at android.os.AsyncTask$InternalHandler.handleMessage (AsyncTask.java:677)
at android.os.Handler.dispatchMessage (Handler.java:102)
at android.os.Looper.loop (Looper.java:154)
at android.app.ActivityThread.main (ActivityThread.java:6682)
at java.lang.reflect.Method.invoke (Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run (ZygoteInit.java:1520)
at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:1410)
Please solve this issue.