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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)