Почему возникает эта ошибка com.google.appengine.api.taskqueue.TransientFailureException?

Я получил ошибку "com.google.appengine.api.taskqueue.TransientFailureException". Эта ошибка произошла в 21.02.2009 с 05:50 до 06:57 (UTC). Почему произошла эта ошибка?

com.google.appengine.api.taskqueue.TransientFailureException: 
    at com.google.appengine.api.taskqueue.QueueApiHelper.translateError(QueueApiHelper.java:123)
    at com.google.appengine.api.taskqueue.QueueApiHelper.translateError(QueueApiHelper.java:183)
    at com.google.appengine.api.taskqueue.QueueApiHelper$1.convertException(QueueApiHelper.java:60)
    at com.google.appengine.api.utils.FutureWrapper.get(FutureWrapper.java:109)
    at com.google.appengine.api.utils.FutureWrapper.get(FutureWrapper.java:93)
    at com.google.appengine.api.taskqueue.QueueApiHelper.getInternal(QueueApiHelper.java:84)
    at com.google.appengine.api.taskqueue.QueueImpl.add(QueueImpl.java:488)
    at com.flickorder.APIPlan$$anonfun$intent$1$$anonfun$applyOrElse$8$$anonfun$apply$13$$anonfun$apply$14$$anonfun$apply$17$$anonfun$apply$19.apply(APIPlan.scala:398)
    at com.flickorder.APIPlan$$anonfun$intent$1$$anonfun$applyOrElse$8$$anonfun$apply$13$$anonfun$apply$14$$anonfun$apply$17$$anonfun$apply$19.apply(APIPlan.scala:396)
    at scala.collection.Iterator$class.foreach(Iterator.scala:727)
    at scala.collection.AbstractIterator.foreach(Iterator.scala:1157)
    at com.flickorder.APIPlan$$anonfun$intent$1$$anonfun$applyOrElse$8$$anonfun$apply$13$$anonfun$apply$14$$anonfun$apply$17.apply(APIPlan.scala:396)
    at com.flickorder.APIPlan$$anonfun$intent$1$$anonfun$applyOrElse$8$$anonfun$apply$13$$anonfun$apply$14$$anonfun$apply$17.apply(APIPlan.scala:212)
    at com.flickorder.Utils$.withTx(Utils.scala:116)
    at com.flickorder.APIPlan$$anonfun$intent$1$$anonfun$applyOrElse$8$$anonfun$apply$13$$anonfun$apply$14.apply(APIPlan.scala:407)
    at com.flickorder.APIPlan$$anonfun$intent$1$$anonfun$applyOrElse$8$$anonfun$apply$13$$anonfun$apply$14.apply(APIPlan.scala:181)
    at scala.Option.map(Option.scala:145)
    at com.flickorder.APIPlan$$anonfun$intent$1$$anonfun$applyOrElse$8$$anonfun$apply$13.apply(APIPlan.scala:181)
    at com.flickorder.APIPlan$$anonfun$intent$1$$anonfun$applyOrElse$8$$anonfun$apply$13.apply(APIPlan.scala:180)
    at scala.Option$WithFilter.flatMap(Option.scala:207)
    at com.flickorder.APIPlan$$anonfun$intent$1$$anonfun$applyOrElse$8.apply(APIPlan.scala:180)
    at com.flickorder.APIPlan$$anonfun$intent$1$$anonfun$applyOrElse$8.apply(APIPlan.scala:179)
    at scala.Option.flatMap(Option.scala:170)
    at com.flickorder.APIPlan$$anonfun$intent$1.applyOrElse(APIPlan.scala:179)
    at com.flickorder.APIPlan$$anonfun$intent$1.applyOrElse(APIPlan.scala:27)
    at scala.PartialFunction$Lifted.apply(PartialFunction.scala:218)
    at scala.PartialFunction$Lifted.apply(PartialFunction.scala:214)
    at unfiltered.response.Pass$PartialAttempt.attemptWithPass(pass.scala:72)
    at unfiltered.response.Pass$PassingAttempt$class.attempt(pass.scala:65)
    at unfiltered.response.Pass$PartialAttempt.attempt(pass.scala:67)
    at unfiltered.response.Pass$OnPassAttempt$$anonfun$attempt$2.apply(pass.scala:96)
    at unfiltered.response.Pass$OnPassAttempt$$anonfun$attempt$2.apply(pass.scala:96)
    at scala.Option.orElse(Option.scala:257)
    at unfiltered.response.Pass$OnPassAttempt.attempt(pass.scala:95)
    at unfiltered.response.Pass$OnPassAttempt.attempt(pass.scala:95)
    at unfiltered.response.Pass$OnPassAttempt.attempt(pass.scala:95)
    at unfiltered.response.Pass$OnPassAttempt.attempt(pass.scala:95)
    at unfiltered.response.Pass$OnPassAttempt.attempt(pass.scala:95)
    at unfiltered.response.Pass$OnPassAttempt.attempt(pass.scala:95)
    at unfiltered.response.Pass$$anonfun$fold$1.apply(pass.scala:48)
    at unfiltered.response.Pass$FunctionAttempt.apply(pass.scala:77)
    at unfiltered.filter.Plan$class.doFilter(plans.scala:49)
    at jp.co.with_p.ubiorder.UbiOrderPlan.doFilter(GAEPlan.scala:57)
    at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1759)
    at com.google.apphosting.utils.servlet.JdbcMySqlConnectionCleanupFilter.doFilter(JdbcMySqlConnectionCleanupFilter.java:60)
    at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1759)
    at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:582)
    at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
    at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:524)
    at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:226)
    at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
    at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:134)
    at com.google.apphosting.runtime.jetty9.ParseBlobUploadHandler.handle(ParseBlobUploadHandler.java:119)
    at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1182)
    at com.google.apphosting.runtime.jetty9.AppEngineWebAppContext.doHandle(AppEngineWebAppContext.java:171)
    at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:512)
    at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)
    at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1112)
    at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
    at com.google.apphosting.runtime.jetty9.AppVersionHandlerMap.handle(AppVersionHandlerMap.java:296)
    at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:134)
    at org.eclipse.jetty.server.Server.handle(Server.java:539)
    at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:333)
    at com.google.apphosting.runtime.jetty9.RpcConnection.handle(RpcConnection.java:202)
    at com.google.apphosting.runtime.jetty9.RpcConnector.serviceRequest(RpcConnector.java:81)
    at com.google.apphosting.runtime.jetty9.JettyServletEngineAdapter.serviceRequest(JettyServletEngineAdapter.java:123)
    at com.google.apphosting.runtime.JavaRuntime$RequestRunnable.dispatchServletRequest(JavaRuntime.java:703)
    at com.google.apphosting.runtime.JavaRuntime$RequestRunnable.dispatchRequest(JavaRuntime.java:666)
    at com.google.apphosting.runtime.JavaRuntime$RequestRunnable.run(JavaRuntime.java:636)
    at com.google.apphosting.runtime.JavaRuntime$NullSandboxRequestRunnable.run(JavaRuntime.java:829)
    at com.google.apphosting.runtime.ThreadGroupPool$PoolEntry.run(ThreadGroupPool.java:269)
    at java.lang.Thread.run(Thread.java:748)

Спасибо