我尝试使用pyspark从VerticaDb获取数据，但出现了名为“类未找到异常”的错误。
错误：Py4Java错误：调用o165.load时出错。原因：java.lang.ClassNotFoundException:找不到数据源：数据源.垂直数据源
我的代码是：

from pyspark import SparkContext, SparkConf
from pyspark.sql import SQLContext, SparkSession
from pyspark import sql

# Create the spark session

spark = SparkSession \
    .builder \
    .appName("Vertica Connector Pyspark Example") \
    .getOrCreate()
spark_context = spark.sparkContext
sql_context = sql.SQLContext(spark_context)

# The name of our connector for Spark to look up

format = "com.vertica.spark.datasource.VerticaSource"

# Set connector options based on our Docker setup

table = "*****"
db = "*****"
user = "********"
password = "********"
host = "******"
part = "1";
staging_fs_url="****"

# spark.read.format("com.vertica.spark.datasource.VerticaSource").options(opt).load()

readDf = spark.read.load(
 # Spark format
 format=format,
 # Connector specific options
 host=host,
 user=user,
 password=password,
 db=db,
 table=table)

# Print the DataFrame contents

readDf.show()

谢谢