.net - Sequence Contains No Matching Elements Entity Seed Error -

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previously had entity database working. deleted it, out of haste, went run program again (thinking should recreate , repopulate db did before). however, time got weird error: system.invalidoperationexception: sequence contains no matching element

on line of code in "sampledata.cs" file (location seed data comes from):

52:             new list<card>

any idea happening here?

app start method:

 protected void application_start()     {         system.data.entity.database.setinitializer(new              gostopprimer.models.sampledata());         bundleconfig.registerbundles(bundletable.bundles);         arearegistration.registerallareas();          registerglobalfilters(globalfilters.filters);         registerroutes(routetable.routes);     }

gostopentities.cs

public class gostopentities : dbcontext {     public dbset<card> cards { get; set; }     public dbset<cardtype> cardtypes { get; set; }     public dbset<month> months { get; set; }     public dbset<special> specials { get; set; } }

card.cs model

    public class card {     public int cardid { get; set; }     public int cardtypeid { get; set; }     public int monthid { get; set; }     public string name { get; set; }     public string cardarturl { get; set; }     public virtual cardtype cardtype { get; set; }     public virtual month month { get; set; }     public virtual special special { get; set; } }

snippet of sampledata.cs

using system; using system.collections.generic; using system.linq; using system.web; using system.data.entity;  namespace gostopprimer.models {     public class sampledata : dropcreatedatabaseifmodelchanges<gostopentities>     {         protected override void seed(gostopentities context)         {             var cardtypes = new list<cardtype>             {                 new cardtype { name = "kwang" },                    };              var months = new list<month>             {                 new month { name = "january" },                        };              var specials = new list<special>             {                     new special { name = "none" },                 };              new list<card>             {                 new card { name = "pine", cardtype = cardtypes.single(c => c.name == "kwang"), month = months.single(m => m.name == "january"), cardarturl = "/content/images/cards/jan1.gif", special = specials.single(s => s.name == "none") },                 new card { name = "willow/rain", cardtype = cardtypes.single(c => c.name == "kwang"), month = months.single(m => m.name == "january"), cardarturl = "/content/images/cards/dec4.gif", special = specials.single(s => s.name == "none") },             }.foreach(c => context.cards.add(c));             }     } }

"i had forgotten add new "special" field".


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