java.lang.NullPointerException: writer cannot be null!

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writer cannot be null!
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writer cannot be null!
java.lang.NullPointerException: writer cannot be null!
at org.apache.avro.io.ResolvingDecoder.resolve(ResolvingDecoder.java:80)
at org.apache.avro.io.ResolvingDecoder.(ResolvingDecoder.java:49)
at org.apache.avro.io.DecoderFactory.resolvingDecoder(DecoderFactory.java:307)
at org.apache.avro.generic.GenericDatumReader.getResolver(GenericDatumReader.java:125)
at org.apache.avro.generic.GenericDatumReader.read(GenericDatumReader.java:140)

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