Error but code looks correct to me? Its probally something stupid I'm missing.

:

import SwiftUI

struct CompletedWorkoutsView: View {
    @ObservedObject var exerciseData: ExerciseData

    var body: some View {
        NavigationView {
            List {
                ForEach(exerciseData.workouts) { workout in
                    Text("\(workout.exercise.name),- Sets: \(workout.sets),Counts per Set: \(workout.countsPerSet),- Weight Amount: \(workout.weightAmount)")

                }
            }
            .navigationTitle("Completed Workouts")
            .font(.caption)
        }
    }
}

I'm not sure, but a lot of times when I get that kind of error, its due to this. Try adding an id parameter to your ForEach

ForEach(exerciseData.workouts, id: \.self) { workout in
    Text("\(workout.exercise.name),- Sets: \(workout.sets),Counts per Set: \(workout.countsPerSet),- Weight Amount: \(workout.weightAmount)")
}

I discovered my mistake I added a var to my struct and failed to add in corresponding data to my class this is why I got the error. No sooner than I sent in this question it finally dawned on me what I forgot to do. duh...