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java.lang.NullPointerException: 	at org.apache.hadoop.hbase.spark.HBaseRelation.(DefaultSource.scala:125)	at org.apache.hadoop.hbase.spark.DefaultSource.createRelation(DefaultSource.scala:74)	at org.apache.spark.sql.execution.datasources.ResolvedDataSource$.apply(ResolvedDataSource.scala:222)	at org.apache.spark.sql.DataFrameWriter.save(DataFrameWriter.scala:148)	at $iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC.(:36)	at $iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC.(:41)	at $iwC$$iwC$$iwC$$iwC$$iwC$$iwC.(:43)	at $iwC$$iwC$$iwC$$iwC$$iwC.(:45)	at $iwC$$iwC$$iwC$$iwC.(:47)	at $iwC$$iwC$$iwC.(:49)	at $iwC$$iwC.(:51)	at $iwC.(:53)