Sequence contains no elements

at System.Linq.Enumerable.First[TSource](IEnumerable`1 source) at Nice.SharePoint.Services.BlogsService.getBlogFromWebByCaml(String caml, SPWeb web) at Nice.SharePoint.Services.BlogsService.<>c__DisplayClass25.b__24(SPWeb web) at Nice.SharePoint.Code.BL.WebsHelper.<>c__DisplayClass17.b__15(SPWeb web) at Nice.SharePoint.Code.BL.WebsHelper.<>c__DisplayClass34.b__33(SPWeb normalWeb) at Nice.SharePoint.Code.BL.WebsHelper.OpenWebByUrl(String url, Action`1 action) at Nice.SharePoint.Code.BL.WebsHelper.<>c__DisplayClass34.b__32(SPWeb buweb) at Nice.SharePoint.Code.BL.WebsHelper.<>c__DisplayClass3a.b__36(SPWeb adminWeb) at Nice.SharePoint.Code.BL.WebsHelper.OpenWebByUrlAsAdmin(String url, Action`1 action) at Nice.SharePoint.Code.BL.WebsHelper.getNiceBUsAsAdmin(Action`1 action) at Nice.SharePoint.Code.BL.WebsHelper.getNiceBUs(Action`1 action) at Nice.SharePoint.Code.BL.WebsHelper.GetBusinessUnitWebs(Action`1 action) at Nice.SharePoint.Services.BlogsService.getBlogByCaml(String caml, String selectedWebId) at Nice.SharePoint.Services.BlogsService.GetBlogDetailsById(Int32 blogId, String selectedWebId) at Nice.SharePoint.WebParts.SingleBlogDisplay.GetModel() at WebSpinach13.Core.WebParts.BaseTemplateWebPart`1.getParsedRazorWithData() at WebSpinach13.Core.WebParts.BaseTemplateWebPart`1.b__0(String cacheKey) at WebSpinach13.Core.Utils.CacheWrapper.LazyGet[T](String key, CacheDependency dependency, Acquire`1 lazy) at WebSpinach13.Core.Utils.CacheWrapper.LazyGet[T](String key, Acquire`1 lazy) at WebSpinach13.Core.WebParts.BaseTemplateWebPart`1.ParseRazor()