If I try to open 3 apps at the same time (The same user o different users) appears this exception

19:34:06.281 [http-5050-3] ERROR com.abiquo.util.AbiError - Virtual Appliance error Cannot start the virtual appliance.[Error code:ABI-S009 Error ID:0030].
com.sun.ws.management.client.exceptions.FaultException: SOAP Fault: The service cannot comply with the request due to internal processing errors.
     Actor:
      Code: env:Receiver
  Subcodes: wsman:InternalError
    Detail: com.abiquo.abicloud.exception.VirtualMachineException: com.abiquo.abicloud.exception.VirtualMachineException: The session is not authenticated.
            com.abiquo.abicloud.exception.VirtualMachineException: The session is not authenticated.
            VirtualSystemModel:251VirtualAppliance:103OVFModelToVirtualAppliance:332OVFModelToVirtualAppliance:349OVFModelToVirtualAppliance:130VirtualapplianceresourceHandlerImpl:
461VirtualapplianceresourceHandlerImpl:566VirtualapplianceresourceHandler:126virtualapplianceresource_Handler:114ReflectiveRequestDispatcher:109ReflectiveRequestDispatcher:1WSManAg
ent:115

        at com.sun.ws.management.client.ResourceFactory.create(ResourceFactory.java:332) [wiseman16.jar:na]
        at com.sun.ws.management.client.ResourceFactory.create(ResourceFactory.java:164) [wiseman16.jar:na]
        at com.sun.ws.management.client.ResourceFactory.create(ResourceFactory.java:137) [wiseman16.jar:na]
        at com.abiquo.abiserver.abicloudws.VirtualApplianceWS.startVirtualAppliance(VirtualApplianceWS.java:106) [VirtualApplianceWS.class:na]
        at com.abiquo.abiserver.commands.VirtualApplianceCommand.startVirtualAppliance(VirtualApplianceCommand.java:1147) [VirtualApplianceCommand.class:na]
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [na:1.6.0_12]
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) [na:1.6.0_12]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) [na:1.6.0_12]
        at java.lang.reflect.Method.invoke(Unknown Source) [na:1.6.0_12]
        at com.abiquo.abiserver.commands.BasicCommand.onExecute(BasicCommand.java:202) [BasicCommand.class:na]
        at com.abiquo.abiserver.commands.BasicCommand.execute(BasicCommand.java:117) [BasicCommand.class:na]
        at com.abiquo.abiserver.services.flex.NonBlockingService.startVirtualAppliance(NonBlockingService.java:158) [NonBlockingService.class:na]
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [na:1.6.0_12]
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) [na:1.6.0_12]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) [na:1.6.0_12]
        at java.lang.reflect.Method.invoke(Unknown Source) [na:1.6.0_12]
        at flex.messaging.services.remoting.adapters.JavaAdapter.invoke(JavaAdapter.java:406) [flex-messaging-remoting.jar:3.0.0.544]
        at flex.messaging.services.RemotingService.serviceMessage(RemotingService.java:183) [flex-messaging-remoting.jar:3.0.0.544]
        at flex.messaging.MessageBroker.routeMessageToService(MessageBroker.java:1417) [flex-messaging-core.jar:3.0.0.544]
        at flex.messaging.endpoints.AbstractEndpoint.serviceMessage(AbstractEndpoint.java:878) [flex-messaging-core.jar:3.0.0.544]
        at flex.messaging.endpoints.amf.MessageBrokerFilter.invoke(MessageBrokerFilter.java:121) [flex-messaging-core.jar:3.0.0.544]
        at flex.messaging.endpoints.amf.LegacyFilter.invoke(LegacyFilter.java:158) [flex-messaging-core.jar:3.0.0.544]
        at flex.messaging.endpoints.amf.SessionFilter.invoke(SessionFilter.java:49) [flex-messaging-core.jar:3.0.0.544]
        at flex.messaging.endpoints.amf.BatchProcessFilter.invoke(BatchProcessFilter.java:67) [flex-messaging-core.jar:3.0.0.544]
        at flex.messaging.endpoints.amf.SerializationFilter.invoke(SerializationFilter.java:146) [flex-messaging-core.jar:3.0.0.544]
        at flex.messaging.endpoints.BaseHTTPEndpoint.service(BaseHTTPEndpoint.java:274) [flex-messaging-core.jar:3.0.0.544]
        at flex.messaging.MessageBrokerServlet.service(MessageBrokerServlet.java:377) [flex-messaging-core.jar:3.0.0.544]
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) [servlet-api.jar:na]
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) [catalina.jar:na]
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) [catalina.jar:na]
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233) [catalina.jar:na]
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) [catalina.jar:na]
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128) [catalina.jar:na]
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) [catalina.jar:na]
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) [catalina.jar:na]
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286) [catalina.jar:na]
        at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:845) [tomcat-coyote.jar:na]
        at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583) [tomcat-coyote.jar:na]
        at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447) [tomcat-coyote.jar:na]
        at java.lang.Thread.run(Unknown Source) [na:1.6.0_12]