value toDF is not a member of Seq[(Int,String)] - scala

Question

I am trying to execute the following code but getting this error:
value toDF is not a member of Seq[(Int,String)].
I have the case class outside main and I have imported implicits too. But still I am getting this error. Can someone help me to resolve this ? I am using Spark 2.11-2.1.0 and Scala 2.11.8
import org.apache.spark.sql._
import org.apache.spark.ml.clustering._
import org.apache.spark.ml.feature.VectorAssembler
import org.apache.spark._
final case class Email(id: Int, text: String)
object SampleKMeans {
def main(args: Array[String]) = {
val spark = SparkSession.builder.appName("SampleKMeans")
.master("yarn")
.getOrCreate()
import spark.implicits._
val emails = Seq(
"This is an email from...",
"SPAM SPAM spam",
"Hello, We'd like to offer you")
.zipWithIndex.map(_.swap).toDF("id", "text").as[Email]
}
}

Answer 1

You already have a SparkSession you can just import the spark.implicits._ will work in your case
val spark = SparkSession.builder.appName("SampleKMeans")
.master("local[*]")
.getOrCreate()
import spark.implicits._
Now toDF method works as expected.
If the error still exists, You need to check the version of spark and scala libraries that you are using.
Hope this helps!