Object reference not set to an instance of an object.

   at lambda_method(Closure , MapViewModel )
   at Glass.Mapper.Sc.GlassHtml.NormalModeOutput[T](Expression`1 field, Expression`1 standardOutput, T model, SafeDictionary`1 dictionary) in C:\TeamCity\buildAgent\work\9693a2d38f55a4a\Source\Glass.Mapper.Sc\GlassHtml.cs:line 639
   at Glass.Mapper.Sc.GlassHtml.MakeEditable[T](Expression`1 field, Expression`1 standardOutput, T model, Object parameters, Context context, Database database, TextWriter writer) in C:\TeamCity\buildAgent\work\9693a2d38f55a4a\Source\Glass.Mapper.Sc\GlassHtml.cs:line 603