Struggle to read csv file - scala

Question

I am struggling to figure out how i can work with CSV files in scala. I have this code and i have tried to implement various types of codes for csv reading etc, but not been able to actually read a file at all. the // read file is me trying / my late4st attempemt but i get an : object Source is not a member of package org.apache.http.io
[error] val filename = io.Source.fromFile("countries.csv")
Cn someone help me out what am i doing wrong ?
import java.io._
import org.apache.commons._
import org.apache.http._
import org.apache.http.client._
import org.apache.http.client.methods.HttpPost
import org.apache.http.impl.client.DefaultHttpClient
import java.util.ArrayList
import org.apache.http.message.BasicNameValuePair
import org.apache.http.client.entity.UrlEncodedFormEntity
import com.google.gson.Gson
import scala.io.Source
case class Teacher(firstName: String, lastName: String, age: Int)
//case class Country(name: String, region: String, population: Int, area: Int, popDensity: Int, coastline: Int, netmigration: Int, infantMortality: Int, gdp: Int, literacy: Int, phones: Int, arable: Int, crops: Int, other: Int, climate: Int, birthrate: Int,deathrate: Int, agriculture: Int, industry: Int, service: Int)
object HttpJsonPostTest extends App {
//read data
val filename = io.Source.fromFile("countries.csv")
for(line <- filename.getLines){
val col = line.split(",").map(_.trim)
println(s"${cols(0)}|${cols(1)}|${cols(2)}|${cols(3)}")
}
// create our object as a json string
val marius = new Teacher("Lucas", "Geitle", 32)
val mariusAsJson = new Gson().toJson(marius)
// add name value pairs to a post object
val post = new HttpPost("http://127.0.0.1:2379/v2/keys/big_data_course1")
val nameValuePairs = new ArrayList[NameValuePair]()
nameValuePairs.add(new BasicNameValuePair("value", mariusAsJson))
post.setEntity(new UrlEncodedFormEntity(nameValuePairs))
// send the post request
val client = new DefaultHttpClient
val response = client.execute(post)
println("--- HEADERS ---")
response.getAllHeaders.foreach(arg => println(arg))
}