com.thinkaurelius.titan.core.TitanException: Could not execute operation due to backend exception

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Could not execute operation due to backend exception
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Could not execute operation due to backend exception
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Could not execute operation due to backend exception
com.thinkaurelius.titan.core.TitanException: Could not execute operation due to backend exception
at com.thinkaurelius.titan.diskstorage.util.BackendOperation.execute(BackendOperation.java:44)
at com.thinkaurelius.titan.diskstorage.keycolumnvalue.cache.CacheTransaction.persist(CacheTransaction.java:87)
at com.thinkaurelius.titan.diskstorage.keycolumnvalue.cache.CacheTransaction.flushInternal(CacheTransaction.java:141)
at com.thinkaurelius.titan.diskstorage.keycolumnvalue.cache.CacheTransaction.commit(CacheTransaction.java:198)
at com.thinkaurelius.titan.diskstorage.BackendTransaction.commit(BackendTransaction.java:135)
at com.thinkaurelius.titan.graphdb.database.StandardTitanGraph.commit(StandardTitanGraph.java:692)
at com.thinkaurelius.titan.graphdb.tinkerpop.TitanBlueprintsGraph$GraphTransaction.doCommit(TitanBlueprintsGraph.java:263)
at org.apache.tinkerpop.gremlin.structure.util.AbstractTransaction.commit(AbstractTransaction.java:94)
at com.ge.predix.acs.privilege.management.dao.GraphGenericRepository.save(GraphGenericRepository.java:113)
at com.ge.predix.acs.privilege.management.dao.ResourceMigrationManager.doResourceMigration(ResourceMigrationManager.java:52)
at com.ge.predix.acs.privilege.management.dao.ResourceMigrationManager.run(ResourceMigrationManager.java:34)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)

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