FsYard error: message is not "user friendly"

1) checkout branch fsYard_error
2) rebuild YC
3) Refresh bin files in yc folder
4) Try to compile MsSQL solution
5) Error in VS output: Message is not "user friendly"

C:\yc\recursive-ascent\Examples\yc\FsYard.targets(11,5): ошибка MSB4018: 
непредвиденная ошибка при выполнении 
задачи "FsYard".
System.Collections.Generic.KeyNotFoundException: Данный ключ 
отсутствует в словаре.
   в System.ThrowHelper.ThrowKeyNotFoundException()
   в System.Collections.Generic.Dictionary`2.get_Item(TKey key)
   в Microsoft.FSharp.Core.ExtraTopLevelOperators.CreateDictionary@45.System-Collections-Generic-IDictionary`2-get_Item(TKey key)
   в Yard.Core.Helpers.getRulesMap@74-1.Invoke(t op)
   в Microsoft.FSharp.Primitives.Basics.List.iter[T](FSharpFunc`2 f, FSharpList`1 x)
   в Yard.Core.Helpers.getRulesMap@71.Invoke(Module`2 module')
   в Microsoft.FSharp.Primitives.Basics.List.mapToFreshConsTail[a,b](FSharpList`1 cons, FSharpFunc`2 f, FSharpList`1 x)
   в Microsoft.FSharp.Primitives.Basics.List.map[T,TResult](FSharpFunc`2 mapping, FSharpList`1 x)
   в Yard.Core.Helpers.getRulesMap[a,b](FSharpList`1 grammar)
   в Yard.Core.Conversions.ExpandMeta.collectMeta@291(FSharpFunc`2 isMetaRule, FSharpList`1 grammar)
   в Yard.Core.Conversions.ExpandMeta.expandMetaRules(FSharpList`1 grammar)
   в Yard.Core.Conversions.ExpandMeta.ExpandMeta.ConvertGrammar(FSharpList`1 grammar, String[] _arg1)
   в Yard.FsYard.applyConversion@10(Conversion conv, String[] parameters, t`2 ilTree)
   в Yard.FsYard.conversions@22-1.Invoke(t`2 il)
   в Microsoft.FSharp.Collections.ListModule.loop@144-20[T,TState](FSharpFunc`3 f, TState s, FSharpList`1 xs)
   в Microsoft.FSharp.Collections.ListModule.Fold[T,TState](FSharpFunc`2 folder, TState state, FSharpList`1 list)
   в Yard.FsYard.generate[a](a inFile, String rnglrArgs)
   в Yard.Build.FsYard.Microsoft-Build-Framework-ITask-Execute()
   в Microsoft.Build.BackEnd.TaskExecutionHost.Microsoft.Build.BackEnd.ITaskExecutionHost.Execute()
   в Microsoft.Build.BackEnd.TaskBuilder.<ExecuteInstantiatedTask>d__20.MoveNext()
Построение проекта "PLSql.fsproj" завершено с 
ошибкой.
Original issue reported on code.google.com by polubelo...@gmail.com on 10 Jul 2013 at 6:18
sanyaade-g2g-repos / recursive-ascent

FsYard error: message is not "user friendly" #95
