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java.lang.NullPointerException: 	at org.apache.cassandra.db.Directories.(Directories.java:77)	at org.apache.cassandra.db.ColumnFamilyStore.createColumnFamilyStore(ColumnFamilyStore.java:408)	at org.apache.cassandra.db.ColumnFamilyStore.createColumnFamilyStore(ColumnFamilyStore.java:393)	at org.apache.cassandra.db.Keyspace.initCf(Keyspace.java:312)	at org.apache.cassandra.db.Keyspace.(Keyspace.java:269)	at org.apache.cassandra.db.Keyspace.open(Keyspace.java:111)	at org.apache.cassandra.db.Keyspace.open(Keyspace.java:89)	at org.apache.cassandra.cql3.statements.UpdateStatement.addUpdateForKey(UpdateStatement.java:109)	at org.apache.cassandra.io.sstable.CQLSSTableWriter.rawAddRow(CQLSSTableWriter.java:218)	at org.apache.cassandra.io.sstable.CQLSSTableWriter.addRow(CQLSSTableWriter.java:138)	at org.apache.cassandra.io.sstable.CQLSSTableWriter.addRow(CQLSSTableWriter.java:113)	at BulkLoad.main(BulkLoad.java:128)