An Exception was raised!

Sequence contains more than one matching element

at System.Linq.Enumerable.SingleOrDefault[TSource](IEnumerable`1 source, Func`2 predicate)
at Storefronts.PortalEngine.Data.Repositories.Article.ArticleRepository.Populate(DataSet dataSet) in c:\builds\pearsontechnology\gpt\stor\PortalEngine\InformIT.NET\Storefronts.PortalEngine.Data\Repositories\Article\ArticleRepository.cs:line 345
at Storefronts.PortalEngine.Data.Repositories.Article.ArticleRepository.GetByAuthorId(Guid id, PartnerId partnerId) in c:\builds\pearsontechnology\gpt\stor\PortalEngine\InformIT.NET\Storefronts.PortalEngine.Data\Repositories\Article\ArticleRepository.cs:line 153
at Storefronts.PortalEngine.Data.Repositories.Author.AuthorRepository.DeepLoad(Author author, PartnerId partnerId, AuthorRepositoryOptions options) in c:\builds\pearsontechnology\gpt\stor\PortalEngine\InformIT.NET\Storefronts.PortalEngine.Data\Repositories\Author\AuthorRepository.cs:line 93
at Storefronts.PortalEngine.Data.Repositories.Author.AuthorRepository.Get(IEnumerable`1 ids, PartnerId partnerId, AuthorRepositoryOptions options) in c:\builds\pearsontechnology\gpt\stor\PortalEngine\InformIT.NET\Storefronts.PortalEngine.Data\Repositories\Author\AuthorRepository.cs:line 271
at Storefronts.PortalEngine.Data.Repositories.Author.AuthorRepository.Get(Guid id, PartnerId partnerId, AuthorRepositoryOptions options) in c:\builds\pearsontechnology\gpt\stor\PortalEngine\InformIT.NET\Storefronts.PortalEngine.Data\Repositories\Author\AuthorRepository.cs:line 171
at Storefronts.Portals.Ptg.TriPro.Controllers.AuthorsController.Bio(String id) in c:\builds\pearsontechnology\gpt\stor\Portals\TriPro.NET\www\Controllers\AuthorsController.cs:line 61
at lambda_method(Closure , ControllerBase , Object[] )
at System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary`2 parameters)
at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters)
at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass42.b__41()
at System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethod(IAsyncResult asyncResult)
at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass37.<>c__DisplayClass39.b__33()
at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass4f.b__49()
at System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethodWithFilters(IAsyncResult asyncResult)
at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass25.<>c__DisplayClass2a.b__20()
at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass25.b__22(IAsyncResult asyncResult)