Greg Jowsiak's "Hi, Speed" widget recreated in Scriptable

Hi, Speed.js

// This script recreates Greg Joswiak's widget that counts down to the "Hi, Speed" Apple Event on October 13th, 2020.
// You can see Greg's widget in this tweet:
// https://twitter.com/gregjoz/status/1313519797879988225
//
// You'll need this image for the background:
// https://i.imgur.com/t9Jr8kL.png
//
// I've stored the image at imgs/hispeed.png Scriptable's folder in iCloud Drive.

let widget = createWidget()
widget.presentMedium()
Script.setWidget(widget)
Script.complete()

function createWidget() {
  let eventDate = createEventDate()
  let time = createRelativeTime(eventDate)
  let bgImg = readBgImage()
  let widget = new ListWidget()
  widget.backgroundImage = bgImg
  widget.addSpacer()
  let wtitle = widget.addText("Apple Event")
  wtitle.font = Font.boldSystemFont(20)
  wtitle.textColor = Color.white()
  widget.addSpacer(2)
  let wtime = widget.addText(time)
  wtime.font = Font.mediumSystemFont(18)
  wtime.textColor = Color.white()
  return widget
}

function createRelativeTime(date) {
  let now = new Date()
  let formatter = new RelativeDateTimeFormatter()
  let str = formatter.string(date, now)
  return capitalizeFirstLetter(str)
}

function createEventDate() {
  let str = "2020-10-13T17:00:00Z"
  let dateFormatter = new DateFormatter()
  dateFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ssZ"
  return dateFormatter.date(str)
}

function readBgImage() {
  let fm = FileManager.iCloud()
  let dir = fm.documentsDirectory()
  let filePath = fm.joinPath(dir, "imgs/hispeed.png")
  return fm.readImage(filePath)
}

function capitalizeFirstLetter(str) {
  return str.charAt(0).toUpperCase() + str.slice(1)
}

Hey buddy, I copied the text and pasted it but I get this error? Can you help? I kinda new to all this so please go gentle on me 😂