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java.util.ConcurrentModificationException at java.util.HashMap$HashIterator.nextEntry(HashMap.java:787) at java.util.HashMap$KeyIterator.next(HashMap.java:814) at java.util.Collections$UnmodifiableCollection$1.next(Collections.java:960) at com.parse.ParseTraverser.visit(ParseTraverser.java:100) at com.parse.ParseTraverser.visit(ParseTraverser.java:94) at com.parse.ParseTraverser.visit(ParseTraverser.java:101) at com.parse.ParseTraverser.visit(ParseTraverser.java:94) at com.parse.ParseTraverser.visit(ParseTraverser.java:101) at com.parse.ParseTraverser.traverse(ParseTraverser.java:137) at com.parse.OfflineStore.saveLocallyAsync(OfflineStore.java:776) at com.parse.OfflineStore.access$200(OfflineStore.java:36) at com.parse.OfflineStore$38.then(OfflineStore.java:1251) at com.parse.OfflineStore$38.then(OfflineStore.java:1227) at bolts.Task$15.run(Task.java:917) at bolts.BoltsExecutors$ImmediateExecutor.execute(BoltsExecutors.java:105) at bolts.Task.completeAfterTask(Task.java:908) at bolts.Task.continueWithTask(Task.java:715) at bolts.Task.continueWithTask(Task.java:726) at bolts.Task$13.then(Task.java:818) at bolts.Task$13.then(Task.java:806) at bolts.Task$15.run(Task.java:917) at bolts.BoltsExecutors$ImmediateExecutor.execute(BoltsExecutors.java:105) at bolts.Task.completeAfterTask(Task.java:908) at bolts.Task.access$100(Task.java:32) at bolts.Task$11.then(Task.java:708) at bolts.Task$11.then(Task.java:705) at bolts.Task.runContinuations(Task.java:956) at bolts.Task.trySetResult(Task.java:994) at bolts.TaskCompletionSource.trySetResult(TaskCompletionSource.java:39) at bolts.TaskCompletionSource.setResult(TaskCompletionSource.java:62) at bolts.Task$15$1.then(Task.java:934) at bolts.Task$15$1.then(Task.java:921) at bolts.Task$14.run(Task.java:872) at bolts.BoltsExecutors$ImmediateExecutor.execute(BoltsExecutors.java:105) at bolts.Task.completeImmediately(Task.java:863) at bolts.Task.continueWith(Task.java:661) at bolts.Task.continueWith(Task.java:672) at bolts.Task$15.run(Task.java:921) at bolts.BoltsExecutors$ImmediateExecutor.execute(BoltsExecutors.java:105) at bolts.Task.completeAfterTask(Task.java:908) at bolts.Task.access$100(Task.java:32) at bolts.Task$11.then(Task.java:708) at bolts.Task$11.then(Task.java:705) at bolts.Task.runContinuations(Task.java:956) at bolts.Task.trySetResult(Task.java:994) at bolts.TaskCompletionSource.trySetResult(TaskCompletionSource.java:39) at bolts.TaskCompletionSource.setResult(TaskCompletionSource.java:62) at bolts.Task$15$1.then(Task.java:934) at bolts.Task$15$1.then(Task.java:921) at bolts.Task$14.run(Task.java:872) at bolts.BoltsExecutors$ImmediateExecutor.execute(BoltsExecutors.java:105) at bolts.Task.completeImmediately(Task.java:863) at bolts.Task.continueWith(Task.java:661) at bolts.Task.continueWith(Task.java:672) at bolts.Task$15.run(Task.java:921) at bolts.BoltsExecutors$ImmediateExecutor.execute(BoltsExecutors.java:105) at bolts.Task.completeAfterTask(Task.java:908) at bolts.Task.access$100(Task.java:32) at bolts.Task$11.then(Task.java:708) at bolts.Task$11.then(Task.java:705) at bolts.Task.runContinuations(Task.java:956) at bolts.Task.trySetResult(Task.java:994) at bolts.TaskCompletionSource.trySetResult(TaskCompletionSource.java:39) at bolts.TaskCompletionSource.setResult(TaskCompletionSource.java:62) at bolts.Task$15$1.then(Task.java:934) at bolts.Task$15$1.then(Task.java:921) at bolts.Task$14.run(Task.java:872) at bolts.BoltsExecutors$ImmediateExecutor.execute(BoltsExecutors.java:105) at bolts.Task.completeImmediately(Task.java:863) at bolts.Task.continueWith(Task.java:661) at bolts.Task.continueWith(Task.java:672) at bolts.Task$15.run(Task.java:921) at bolts.BoltsExecutors$ImmediateExecutor.execute(BoltsExecutors.java:105) at bolts.Task.completeAfterTask(Task.java:908) at bolts.Task.access$100(Task.java:32) at bolts.Task$11.then(Task.java:708) at bolts.Task$11.then(Task.java:705) at bolts.Task.runContinuations(Task.java:956) at bolts.Task.trySetResult(Task.java:994) at bolts.TaskCompletionSource.trySetResult(TaskCompletionSource.java:39) at bolts.TaskCompletionSource.setResult(TaskCompletionSource.java:62) at bolts.Task$15$1.then(Task.java:934) at bolts.Task$15$1.then(Task.java:921) at bolts.Task$14.run(Task.java:872) at bolts.BoltsExecutors$ImmediateExecutor.execute(BoltsExecutors.java:105) at bolts.Task.completeImmediately(Task.java:863) at bolts.Task.continueWith(Task.java:661) at bolts.Task.continueWith(Task.java:672) at bolts.Task$15.run(Task.java:921) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587) at java.lang.Thread.run(Thread.java:818)