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The error message "org.apache.spark.SparkException: Task failed while writing rows" likely means that there was an issue with writing the data to the Bigtable. This could be due to a number of factors, such as network connectivity issues, improper configuration of the Dataproc serverless service or Bigtable instance, or a problem with the data being written itself. It's recommended to check the logs and error messages in more detail to gather more information about the specific cause of the error.