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org.apache.avro.AvroRuntimeException: not open	at org.apache.avro.file.DataFileWriter.assertOpen(DataFileWriter.java:82)	at org.apache.avro.file.DataFileWriter.append(DataFileWriter.java:287)	at com.harmeetsingh13.java.producers.avroserializer.AvroProducer.main(AvroProducer.java:57)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:498)	at com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)