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java.lang.NullPointerException: 	at com.emc.storageos.volumecontroller.impl.smis.CIMObjectPathCreatorFactory.getGroupSynchronized(CIMObjectPathCreatorFactory.java:98)	at com.sun.proxy.$Proxy37.getGroupSynchronized(Unknown Source)	at com.emc.storageos.volumecontroller.impl.smis.CIMObjectPathFactoryAdapter.getGroupSynchronized(CIMObjectPathFactoryAdapter.java:96)	at com.emc.storageos.volumecontroller.impl.smis.vmax.VmaxSnapshotOperations.establishVolumeSnapshotGroupRelation(VmaxSnapshotOperations.java:1411)	at com.emc.storageos.volumecontroller.impl.smis.SmisStorageDevice.doEstablishVolumeSnapshotGroupRelation(SmisStorageDevice.java:2734)	at com.emc.storageos.volumecontroller.impl.block.BlockDeviceController.establishVolumeSnapshotGroupRelation(BlockDeviceController.java:2049)	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:497)	at com.emc.storageos.volumecontroller.impl.smis.CIMObjectPathFactoryInvocationHandler.delegate(CIMObjectPathFactoryInvocationHandler.java:92)	at com.emc.storageos.volumecontroller.impl.smis.CIMObjectPathFactoryInvocationHandler.invoke(CIMObjectPathFactoryInvocationHandler.java:78)