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java.lang.NullPointerException: 	at org.apache.commons.vfs2.impl.DefaultFileSystemManager.closeFileSystem(DefaultFileSystemManager.java:1126)	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)