Windows phone 8: Cant create table (local database), breaks at mydb.submitchanges().

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C#3.5

database

Windows-Phone-8

Here is my code for database

public class DbDataContext : DataContext
{ public DbDataContext()
    : base("Data Source=isostore:/MainDb.sdf")
{
    if (false == this.DatabaseExists())
        this.CreateDatabase();
}

public Table<S_List> FigureList;
}
[Table]
public class S_List
{
[Column(IsPrimaryKey = true, IsDbGenerated = true, DbType = "INT NOT NULL Identity", CanBeNull = false, AutoSync = AutoSync.OnInsert)]
public int Id { get; set; }
[Column]
public int s_publicfigureid { get; set; }
[Column]
public string s_name { get; set; }
[Column]
public Uri s_imageurl { get; set; }
}

and here is the code how i add entries to table

 private void wish_Checked(object sender, RoutedEventArgs e)
{
ToggleImageButton tgl = sender as ToggleImageButton;
var selectedItem = tgl.DataContext as User;
mydb.FigureList.InsertOnSubmit(new S_List
{
s_publicfigureid = selectedItem.publicfigureid,
s_name = selectedItem.name,
s_imageurl = selectedItem.imageurl,
});
mydb.SubmitChanges();
}

And this is error i get A first chance exception of type 'System.Data.SqlServerCe.SqlCeException' occurred in System.Data.Linq.ni.dll at line mydb.SubmitChanges();