Not enough replicas available for query at consistency LOCAL_QUORUM (2 required but only 1 alive)

made only one node and the replication factor is 3 of the table I am updating from Spark to cassandra with the help of spark-cassandra connector.
Is shows this error:
ERROR QueryExecutor:72 - Failed to execute: com.datastax.spark.connector.writer.RichBoundStatement@516ec2e8
com.datastax.driver.core.exceptions.UnavailableException: Not enough replicas available for query at consistency LOCAL_QUORUM (2 required but only 1 alive)
AND
although the consistency of my cassandra cluster is ONE. I dont know why it is saying LOCAL_QUORUM as consistency