java.lang.NullPointerException: This exception has no message.

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This exception has no message.
java.lang.NullPointerException	at io.confluent.connect.hdfs.DataWriter.write(DataWriter.java:234)	at io.confluent.connect.hdfs.HdfsSinkTask.put(HdfsSinkTask.java:91)	at org.apache.kafka.connect.runtime.WorkerSinkTask.deliverMessages(WorkerSinkTask.java:381)	at org.apache.kafka.connect.runtime.WorkerSinkTask.poll(WorkerSinkTask.java:227)	at org.apache.kafka.connect.runtime.WorkerSinkTask.iteration(WorkerSinkTask.java:170)	at org.apache.kafka.connect.runtime.WorkerSinkTask.execute(WorkerSinkTask.java:142)	at org.apache.kafka.connect.runtime.WorkerTask.doRun(WorkerTask.java:140)	at org.apache.kafka.connect.runtime.WorkerTask.run(WorkerTask.java:175)	at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)	at java.util.concurrent.FutureTask.run(Unknown Source)	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)	at java.lang.Thread.run(Unknown Source)