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

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java.lang.NullPointerException:
at org.objectweb.proactive.extensions.dataspaces.vfs.VFSMountManagerHelper.closeFileSystems(VFSMountManagerHelper.java:316)
at org.objectweb.proactive.extensions.dataspaces.vfs.VFSSpacesMountManagerImpl.unmountAllFileSystems(VFSSpacesMountManagerImpl.java:414)
at org.objectweb.proactive.extensions.dataspaces.vfs.VFSSpacesMountManagerImpl.close(VFSSpacesMountManagerImpl.java:223)
at org.objectweb.proactive.extensions.dataspaces.core.NodeConfigurator$NodeApplicationConfigurator.close(NodeConfigurator.java:410)
at org.objectweb.proactive.extensions.dataspaces.core.NodeConfigurator$NodeApplicationConfigurator.access$300(NodeConfigurator.java:357)
at org.objectweb.proactive.extensions.dataspaces.core.NodeConfigurator.tryCloseAppConfigurator(NodeConfigurator.java:303)
at org.objectweb.proactive.extensions.dataspaces.core.NodeConfigurator.close(NodeConfigurator.java:280)
at org.objectweb.proactive.extensions.dataspaces.core.DataSpacesNodes.closeNodeConfig(DataSpacesNodes.java:237)
at org.ow2.proactive.resourcemanager.nodesource.dataspace.DataSpaceNodeConfigurationAgent.closeNodeConfiguration(DataSpaceNodeConfigurationAgent.java:280)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.objectweb.proactive.core.mop.MethodCall.execute(MethodCall.java:353)
at org.objectweb.proactive.core.body.request.RequestImpl.serveInternal(RequestImpl.java:214)
at org.objectweb.proactive.core.body.request.RequestImpl.serve(RequestImpl.java:160)
at org.objectweb.proactive.core.body.BodyImpl$ActiveLocalBodyStrategy.serveInternal(BodyImpl.java:552)
at org.objectweb.proactive.core.body.BodyImpl$ActiveLocalBodyStrategy.serve(BodyImpl.java:485)
at org.objectweb.proactive.core.body.AbstractBody.serve(AbstractBody.java:426)
at org.objectweb.proactive.Service.serve(Service.java:128)
at org.objectweb.proactive.Service.blockingServeOldest(Service.java:214)
at org.objectweb.proactive.Service.blockingServeOldest(Service.java:189)
at org.objectweb.proactive.Service.fifoServing(Service.java:150)
at org.objectweb.proactive.core.body.ActiveBody$FIFORunActive.runActivity(ActiveBody.java:337)
at org.objectweb.proactive.core.body.ActiveBody.run(ActiveBody.java:175)
at java.lang.Thread.run(Thread.java:745)

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