I am using UI-o-Matic to have a CRUD view for a table in my SQL DB in my Umbraco Backoffice.

This is the table in my DB: https://i.imgur.com/caQLQyU.png

Currently I only want to show 3 column in the CRUD, which I have specified in my model class here:

[UIOMatic("booking", "Bookinger", "Booking", FolderIcon = "icon-calendar-alt", ItemIcon = "icon-sunny")]
    [TableName("dbo.Booking")]
    public class Booking
    {
        [PrimaryKeyColumn(AutoIncrement = true)]
        public int BookingId { get; set; }

        [Required]
        [UIOMaticField(Name = "Navn", Description = "")]
        public string Navn { get; set; }

        [Required]
        [UIOMaticField(Name = "Addresse", Description = "")]
        public string Addresse { get; set; }

        [UIOMaticField(Description = "Example checkbox property",
            View = UIOMatic.Constants.FieldEditors.CheckBox)]
        public bool Godkendt { get; set; }
    }

I am getting a 404 error when i select any of my items in the dashboard as well as this error: https://i.imgur.com/y3nmmft.png

What am I doing wrong here?