I am using the SwiftCharts library found here.
I have the following code:
class ChartTestViewController: UIViewController {
@IBOutlet weak var chartView: UIView!
override func viewDidLoad() {
    super.viewDidLoad()
    let xaxis = ["monday", "tuesday", "wednesday", "thursday", "friday"]
    let yaxis = [1, 2, 3, 4, 5]
    let letdoublearray = yaxis.map { Double($0) }
    let tuples = zip(xaxis, letdoublearray).map { ($0, $1) }
    let chartConfig = BarsChartConfig(
        valsAxisConfig: ChartAxisConfig(from: 0, to: 8, by: 2)
    )
    let frame = CGRect(x: 0, y: 70, width: 300, height: 500)
    let chart = BarsChart(
        frame: frame,
        chartConfig: chartConfig,
        xTitle: "X axis",
        yTitle: "Y axis",
        bars: tuples,
        color: UIColor.red,
        barWidth: 20
    )
    self.chart = chart // error here
    self.chartView = chart.view
I am getting an error at the self.chart = chart line saying chart is not a member of the class. I already have chart defined so I am not sure where else I need to create another chart variable. 
 
                        
Your view controller does not have a
chartproperty. Simply add one.