androidstudioでMPAndroidChartを使いグラフを作るにはどうしたらいいですか？

androidstudioでMPAndroidChartで折れ線グラフを作っています。

実行すると、エラーが
AILURE: Build failed with an exception.

What went wrong:

Execution failed for task ':app:compileDebugKotlin'.

Compilation error. See log for more details

Try:

Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

Get more help at https://help.gradle.org

BUILD FAILED in 28s

このように出ます。

package com.example.production_environment

import android.app.Activity
import android.os.Bundle
import android.view.View
import com.github.mikephil.charting.charts.LineChart
import com.github.mikephil.charting.data.Entry
import com.github.mikephil.charting.data.LineData
import com.github.mikephil.charting.data.LineDataSet
import java.util.*


class Cal_g : Activity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        val lineChart = findViewById<View>(R.id.line_chart) as LineChart
        val dataSets = ArrayList<LineDataSet>()

        // X軸の値
        val xValues = ArrayList<String>()
        xValues.add("No.1")
        xValues.add("No.2")
        xValues.add("No.3")
        xValues.add("No.4")
        xValues.add("No.5")

        // value
        val value = ArrayList<Entry>()
            value.add(Entry(100F, 0F))
            value.add(Entry(120F, 1F))
            value.add(Entry(150F, 2F))
            value.add(Entry(250F, 3F))
             value.add(Entry(500F, 4F))
        val valueDataSet = LineDataSet(value, "sample")
        dataSets.add(valueDataSet)
        lineChart.data = LineData(xValues, dataSets)
    }
}