The error indicates a missing Kafka client dependency for Spark in Databricks. Ensure the correct Kafka connector library is attached to your Databricks cluster, such as org.apache.spark:spark-sql-kafka-0-10_2.12:x.x.x (replace x.x.x with your Spark version). Additionally, verify that the Kafka.sasl. jars.config parameter is properly formatted and the required Kafka dependencies (e.g., Kafka clients) are compatible with the Spark version. If the issue persists, check your cluster's runtime environment for any conflicts or missing JARs.