Engineering Elixir Applications: End of Chapter 2, github_issues_labels

@elliefairholm and @Gilacost

All of Chapter 2 works fine until this last bit.
variable “issues” {
type = list(object({
title = string
body = string
labels = list(string)
milestone = string
}))
}

resource “github_issue” “tasks” {
count = length(var.issues)
repository = github_repository.kanban.name
title = var.issues[count.index].title
body = var.issues[count.index].body
milestone_number = github_repository_milestone.epics[var.issues[count.index].milestone].number
labels = [for l in var.issues[count.index].labels :
github_issue_label.issues_labels[l].name]

Error: Invalid index

│ on main.tf line 77, in resource “github_issue” “tasks”:
│ 77: github_issue_label.issues_labels[l].name]
│ ├────────────────
│ │ github_issue_label.issues_labels is object with 15 attributes

│ The given key does not identify an element in this collection value.