Xamarin.Forms SQLite exception - don't know about <Custom Class>

I am trying to create a new SQLite table in an SQLite database. However, whenever I run the code db.CreateTable<Set>();, I get a System.NotSupportedException. I viewed these other posts:

Xamarin.Forms Sqlite-net NotSupportedException on ManyToOne relationship "Don't know about <model>" Not my issue. I only have using SQLite; (SQLite-net-pcl), and when I remove that I get an error around SQLiteConnection(dbPath).

SQLite doesn't know about class Also not a problem. Set is public, and contains no static elements.

Error Message:

System.NotSupportedException: Don't know about App1.Models.Set

Code for creating the db:

public static string dbPath = Path.Combine(
                Environment.GetFolderPath(Environment.SpecialFolder.Personal),
                "database.db3");

var db = new SQLiteConnection(dbPath);
            db.CreateTable<Set>();
            db.CreateTable<Card>();

Set class:

using SQLite;

namespace App1.Models
{
    [Table("Set")]
    public class Set
    {
        [MaxLength(64)]
        public string name { get; set; }
        [PrimaryKey]
        public string code { get; set; }
        public int amount { get; set; }
        [MaxLength(24)]
        public string plane { get; set; }

        public Set(string _name, string _code, int _amount, string _plane)
        {
            name = _name;
            code = _code;
            amount = _amount;
            plane = _plane;
        }
    }
}