Fatal Error - Couldn't parse lesssonData.json as array <Lesson>

Hello, I've completed the Landmarks App Apple Developer tutorial, since finishing it I decided to create a project using the .JSON code from the project.

I've wrote the code in an identical layout as the tutorial, however I am receiving the error - Couldn't parse lesssonData.json as array <Lesson> - when trying to load a preview and the app builds successfully but crashes when I launch it.

Below is the code, any help is appreciated!

LessonList.swift

import SwiftUI

struct LessonList: View {
    var lesson: Lesson
    
    var body: some View {
        VStack {
            List {
                Section {
                    ForEach(lessons, id: \.self) { lesson in
                        Label(lesson.name, systemImage: "house")
                    }
                }
                Section {
                    Label("Hello World!", systemImage: "globe")
                }
            }
        }
    }
}

struct LessonList_Previews: PreviewProvider {
    static var lessons = ModelData().lessons
    static var previews: some View {
        LessonList(lesson: lessons[0])
    }
}

ModelData.swift

import Foundation
import Combine

final class ModelData: ObservableObject {
    @Published var lessons: [Lesson] = load("lessonData.json")
}
var lessons: [Lesson] = load("lessonData.json")

func load<T: Decodable>(_ filename: String) -> T {
    let data: Data

    guard let file = Bundle.main.url(forResource: filename, withExtension: nil)
        else {
            fatalError("Couldn't find \(filename) in main bundle.")
    }

    do {
        data = try Data(contentsOf: file)
    } catch {
        fatalError("Couldn't load \(filename) from main bundle:\n\(error)")
    }

    do {
        let decoder = JSONDecoder()
        return try decoder.decode(T.self, from: data)
    } catch {
        fatalError("Couldn't parse \(filename) as \(T.self):\n\(error)") // Error on this Line
    }
}

lessonData.JSON

[
    {
        "id":"1001",
        "lessonNo":"Lesson 1",
        "name":"Introduction to Photography",
        "category":"Introduction",
    },
    {
        "id":"1002",
        "lessonNo":"Lesson 2",
        "name":"Negative and Positive Space",
        "category":"Introduction",
    },
    {
        "id":"1003",
        "lessonNo":"Lesson 3",
        "name":"Introduction to Camera Angles",
        "category":"Introduction",
    },
    {
        "id":"1004",
        "lessonNo":"Lesson 4",
        "name":"Lighting and Framing",
        "category":"Beginners",
    },
    {
        "id":"1005",
        "lessonNo":"Lesson 5",
        "name":"Still Photography",
        "category":"Beginners",
    },
    {
        "id":"1006",
        "lessonNo":"Lesson 6",
        "name":"Motion Photograhy",
        "category":"Beginners",
    },
    {
        "id":"1007",
        "lessonNo":"Lesson 7",
        "name":"Aperture and F-Stops",
        "category":"Intermiediate",
    },
    {
        "id":"1008",
        "lessonNo":"Lesson 8",
        "name":"Shutter Speeds",
        "category":"Intermiediate",
    },
    {
        "id":"1009",
        "lessonNo":"Lesson 9",
        "name":"Advanced Framing",
        "category":"Advanced",
    },
    {
        "id":"1010",
        "lessonNo":"Lesson 10",
        "name":"Advanced Aperture, F-Stops and Shutter Speeds",
        "category":"Advanced",
    },
]