Getting weird issue with email sending

[praveeny1986]

Hi,

We are using securesocial 3.0-M5, and play version 2.4.3. And we get the following exception(weird that it occurs only sometimes not always).
Any guidance/resolution will be much appreciated.

play.api.UnexpectedException: Unexpected exception[IllegalStateException: cannot enqueue after timer shutdown]
at play.api.http.HttpErrorHandlerExceptions$.throwableToUsefulException(HttpErrorHandler.scala:261) ~[com.typesafe.play.play_2.11-2.4.6.jar:2.4.6]
at play.api.http.DefaultHttpErrorHandler.onServerError(HttpErrorHandler.scala:191) ~[com.typesafe.play.play_2.11-2.4.6.jar:2.4.6]
at play.api.GlobalSettings$class.onError(GlobalSettings.scala:179) [com.typesafe.play.play_2.11-2.4.6.jar:2.4.6]
at play.core.j.JavaGlobalSettingsAdapter.play$core$j$JavaGlobalSettingsAdapter$$super$onError(JavaGlobalSettingsAdapter.scala:36) [com.typesafe.play.play_2.11-2.4.6.jar:2.4.6]
at play.core.j.JavaGlobalSettingsAdapter$$anonfun$onError$2.apply(JavaGlobalSettingsAdapter.scala:36) [com.typesafe.play.play_2.11-2.4.6.jar:2.4.6]
Caused by: java.lang.IllegalStateException: cannot enqueue after timer shutdown
at akka.actor.LightArrayRevolverScheduler.scheduleOnce(Scheduler.scala:277) ~[com.typesafe.akka.akka-actor_2.11-2.3.13.jar:na]
at akka.actor.Scheduler$class.scheduleOnce(Scheduler.scala:117) ~[com.typesafe.akka.akka-actor_2.11-2.3.13.jar:na]
at akka.actor.LightArrayRevolverScheduler.scheduleOnce(Scheduler.scala:182) ~[com.typesafe.akka.akka-actor_2.11-2.3.13.jar:na]
at securesocial.core.providers.utils.Mailer$Default.sendEmail(Mailer.scala:98) ~[ws.securesocial.securesocial_2.11-3.0-M5.jar:3.0-M5]
at securesocial.core.providers.utils.Mailer$Default.sendAlreadyRegisteredEmail(Mailer.scala:60) ~[ws.securesocial.securesocial_2.11-3.0-M5.jar:3.0-M5]
[[[31merror[[0m] application -