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

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java.lang.NullPointerException:
at org.springframework.batch.item.file.mapping.DefaultLineMapper.mapLine(DefaultLineMapper.java:21)
at org.springframework.batch.item.file.FlatFileItemReader.doRead(FlatFileItemReader.java:151)
at org.springframework.batch.core.step.item.SimpleChunkProvider.doRead(SimpleChunkProvider.java:67)

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