Scala Spark | IntelliJ compilation error on .read and .write - scala

Question

Im new to scala spark. I m trying to read a csv file from S3 and write it into cassandra. The code below on compilation in IntelliJ gives me errors.
Not sure What am I doing wrong. Appreciate your inputs in advance.
scala : 2.11.12
Spark : 2.4.3
import org.apache.spark.sql.Row
import org.apache.spark.sql.types.{DoubleType, StringType, StructField, StructType, IntegerType}
import org.apache.spark.{SparkConf, SparkContext}
import org.apache.spark.sql.cassandra._
import org.apache.spark.sql.SQLContext
import org.apache.spark.sql.functions.col
import com.datastax.spark.connector._
import org.apache.spark.sql.DataFrame
import org.apache.spark.rdd.RDD
object OrderAdjustmentLoad
{
def main(args:Array[String])=
{
val awsAccessKeyId: String = args(0)
val awsSecretAccessKey: String = args(1)
val csvFilePath: String = args(2)
val host: String = args(3)
val username: String = args(4)
val password: String = args(5)
val keyspace: String = args(6)
println("length args: " + args.length)
val conf = new SparkConf(true)
.set("fs.s3n.awsAccessKeyId", awsAccessKeyId)
.set("fs.s3n.awsSecretAccessKey", awsSecretAccessKey)
.set("fs.s3n.impl", "org.apache.hadoop.fs.s3native.NativeS3FileSystem")
.set("spark.cassandra.connection.host", host)
.set("spark.cassandra.connection.port","9042")
.set("spark.cassandra.auth.username", username)
.set("spark.cassandra.auth.password", password)
val sc = new SparkContext(conf)
val schemaHdr = StructType( StructField("a2z_name", StringType) ::
StructField("a2z_key", StringType) ::
StructField("a2z_id", IntegerType) :: Nil
)
val df = sc
.read
.format("csv")
.option("header", "true")
.option("delimiter", "\t")
.option("quote", "\"")
.schema(schemaHdr)
.load("s3n://"+csvFilePath)
println(df.count())
val sqlContext = new SQLContext(sc)
df.write
.format("org.apache.spark.sql.cassandra")
.option("keyspace","poc_sparkjob")
.option("table","a2z")
.mode(org.apache.spark.sql.SaveMode.Append)
.save
sc.stop()
}
}
Errors
Cannot resolve symbol read
Cannot resolve symbol write