Error: org.apache.avro.AvroTypeException: Found tab_mobile_oper, expecting union

Error: org.apache.avro.AvroTypeException: Found tab_mobile_oper, expecting union
        at org.apache.avro.io.ResolvingDecoder.doAction(ResolvingDecoder.java:231)
        at org.apache.avro.io.parsing.Parser.advance(Parser.java:88)
        at org.apache.avro.io.ResolvingDecoder.readIndex(ResolvingDecoder.java:206)
        at org.apache.avro.generic.GenericDatumReader.read(GenericDatumReader.java:152)
        at org.apache.avro.generic.GenericDatumReader.read(GenericDatumReader.java:139)
        at org.apache.avro.file.DataFileStream.next(DataFileStream.java:233)
        at org.apache.avro.mapred.AvroRecordReader.next(AvroRecordReader.java:69)
        at org.apache.avro.mapred.AvroRecordReader.next(AvroRecordReader.java:34)
        at org.apache.hadoop.mapred.MapTask$TrackedRecordReader.moveToNext(MapTask.java:197)
        at org.apache.hadoop.mapred.MapTask$TrackedRecordReader.next(MapTask.java:183)
        at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:52)
        at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:429)
        at org.apache.hadoop.mapred.MapTask.run(MapTask.java:341)
        at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:162)
        at java.security.AccessController.doPrivileged(Native Method)
        at javax.security.auth.Subject.doAs(Subject.java:415)
        at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1491)
        at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:157)
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这个是什么原因？