Error CrashlyticsCore

CrashlyticsCore: Error creating marker: crash_marker
                                                  java.io.IOException: open failed: EMFILE (Too many open files)
                                                      at java.io.File.createNewFile(File.java:941)
                                                      at com.crashlytics.android.core.CrashlyticsFileMarker.create(CrashlyticsFileMarker.java:36)
                                                      at com.crashlytics.android.core.CrashlyticsCore.createCrashMarker(CrashlyticsCore.java:816)
                                                      at com.crashlytics.android.core.CrashlyticsController$6.call(CrashlyticsController.java:290)
                                                      at com.crashlytics.android.core.CrashlyticsController$6.call(CrashlyticsController.java:285)
                                                      at java.util.concurrent.FutureTask.run(FutureTask.java:237)
                                                      at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
                                                      at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
                                                      at a.a.a.a.a.b.n$1$1.onRun(ExecutorUtils.java:75)
                                                      at a.a.a.a.a.b.h.run(BackgroundPriorityRunnable.java:30)
                                                      at java.lang.Thread.run(Thread.java:818)
                                                   Caused by: android.system.ErrnoException: open failed: EMFILE (Too many open files)
                                                      at libcore.io.Posix.open(Native Method)
                                                      at libcore.io.BlockGuardOs.open(BlockGuardOs.java:186)
                                                      at java.io.File.createNewFile(File.java:934)
                                                      at com.crashlytics.android.core.CrashlyticsFileMarker.create(CrashlyticsFileMarker.java:36)
                                                      at com.crashlytics.android.core.CrashlyticsCore.createCrashMarker(CrashlyticsCore.java:816)
                                                      at com.crashlytics.android.core.CrashlyticsController$6.call(CrashlyticsController.java:290)
                                                      at com.crashlytics.android.core.CrashlyticsController$6.call(CrashlyticsController.java:285)
                                                      at java.util.concurrent.FutureTask.run(FutureTask.java:237)
                                                      at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
                                                      at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
                                                      at a.a.a.a.a.b.n$1$1.onRun(ExecutorUtils.java:75)
                                                      at a.a.a.a.a.b.h.run(BackgroundPriorityRunnable.java:30)
                                                      at java.lang.Thread.run(Thread.java:818)