com.google.apphosting.api.ApiProxy$CallNotFoundException: Can't make API call taskqueue.BulkAdd in a thread that is neither the original request thread nor a thread created by ThreadManager

[mimimumu]

Hello, I encountered a crash when using it, do you know what the problem is?

com.google.apphosting.api.ApiProxy$CallNotFoundException: Can't make API call taskqueue.BulkAdd in a thread that is neither the original request thread nor a thread created by ThreadManager
	at com.google.apphosting.api.ApiProxy$CallNotFoundException.foreignThread(ApiProxy.java:800)
	at com.google.apphosting.api.ApiProxy$1.get(ApiProxy.java:179)
	at com.google.apphosting.api.ApiProxy$1.get(ApiProxy.java:176)
	at com.google.appengine.api.utils.FutureWrapper.get(FutureWrapper.java:89)
	at com.google.appengine.api.utils.FutureWrapper.get(FutureWrapper.java:89)
	at com.google.appengine.api.utils.FutureWrapper.get(FutureWrapper.java:89)
	at com.google.appengine.api.taskqueue.QueueApiHelper.getInternal(QueueApiHelper.java:78)
	at com.google.appengine.api.taskqueue.QueueImpl.add(QueueImpl.java:400)
	at main.java.com.firstrowria.pushnotificationtester.NotificationServlet.doGet(NotificationServlet.java:31)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:634)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
	at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:690)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:373)
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868)
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1590)
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.lang.Thread.run(Thread.java:748)

Appears in NotificationServlet

 (QueueFactory.getQueue ("NotificationQueue")). Add (taskOptions);