Witam,
mam problem z utworzeniem i dodaniem wpisu do bazy danych SQLite za pomocą frameworka Entity, pojawia się błąd: "Sequence contains no matching element".
Oto moje klasy modelowe oraz ustawienia połączenia:

    public class Operator
    {
        public Operator() { }
        [Key]
        public int Id { get; set; }
        public string Login { get; set; }
    }
public class BaseContext : DbContext
    {
        public BaseContext() : base("name=MyContext") {
           
     }
public DbSet<Operator> Operators { get; set; }

protected override void OnModelCreating(DbModelBuilder modelBuilder)
        {
            //Configure default schema
            base.OnModelCreating(modelBuilder);
            modelBuilder.Conventions.Remove<PluralizingTableNameConvention>();
        }

static BaseContext()
        {
            Database.SetInitializer<BaseContext>(new CreateDatabaseIfNotExists<BaseContext>());
        }
}

Metoda wywoływana

private void CreateDbEntity()
        {
            using (var ctx = new BaseContext())
            {
                Operator user = new Operator() { Login = "aaa" };
                ctx.Operators.Add(user); // tutaj występuje błąd: "Sequence contains no matching element"
                ctx.SaveChanges();
            }
        }

Ustawienia w pliku App.config

<connectionStrings>
    <add name="MyContext" connectionString="Data Source=D:\Test.sqlite" providerName="System.Data.SQLite.EF6" />
  </connectionStrings>
  <entityFramework>
    <defaultConnectionFactory type="System.Data.Entity.Infrastructure.LocalDbConnectionFactory, EntityFramework">
      <parameters>
        <parameter value="v13.0" />
      </parameters>
    </defaultConnectionFactory>
    <providers>
      <provider invariantName="System.Data.SQLite.EF6" type="System.Data.SQLite.EF6.SQLiteProviderServices, System.Data.SQLite.EF6" />
      <provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />
      <provider invariantName="System.Data.SQLite" type="System.Data.SQLite.EF6.SQLiteProviderServices, System.Data.SQLite.EF6" />
    </providers>
  </entityFramework>
  <system.data>
    <DbProviderFactories>
      <remove invariant="System.Data.SQLite.EF6" />
      <add name="SQLite Data Provider (Entity Framework 6)" invariant="System.Data.SQLite.EF6" description=".NET Framework Data Provider for SQLite (Entity Framework 6)" type="System.Data.SQLite.EF6.SQLiteProviderFactory, System.Data.SQLite.EF6" />
     <remove invariant="System.Data.SQLite" />
      <add name="SQLite Data Provider" invariant="System.Data.SQLite" description=".NET Framework Data Provider for SQLite" type="System.Data.SQLite.SQLiteFactory, System.Data.SQLite" />
    </DbProviderFactories>
  </system.data>