java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at com.hyperion.workflow.engine.server.framework.WorkflowEngineServiceLocal.getUsers(WorkflowEngineServiceLocal.java:780)
at com.hyperion.workflow.engine.server.framework.WorkflowEngineServiceLocal.getUserFromCES(WorkflowEngineServiceLocal.java:536)
at com.hyperion.workflow.engine.server.framework.WorkflowEngineServiceLocal.systemSignOn(WorkflowEngineServiceLocal.java:341)
at com.hyperion.workflow.engine.server.framework.WorkflowEngineServiceLocal.signOn(WorkflowEngineServiceLocal.java:387)
at com.hyperion.workflow.engine.api.base.WorkflowEngine.signOn(WorkflowEngine.java:80)
at com.hyperion.workflow.engine.api.base.WorkflowEngine.trustedSignOn(WorkflowEngine.java:94)
at com.hyperion.workflow.engine.api.base.WorkflowEngine.trustedSignOn(WorkflowEngine.java:90)
at com.hyperion.workflow.agent.TaskReceiver.init(TaskReceiver.java:34)
at javax.servlet.GenericServlet.init(GenericServlet.java:211)
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1105)
at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:932)
at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:3917)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4201)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:759)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:739)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:524)
at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:904)
at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:867)
at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:474)
at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1122)
at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:310)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1021)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:718)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1013)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:442)
at org.apache.catalina.core.StandardService.start(StandardService.java:450)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:709)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:294)

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