Hey All,

I'm running into an issue installing umbraco and the error isn't helpful, to me at least, anyone advise/suggestions would be awesome.

Thanks in advance!

Error: Server Error in '/' Application.

Nullable object must have a value.

[InvalidOperationException: Nullable object must have a value.] System.ThrowHelper.ThrowInvalidOperationException(ExceptionResource resource) +56 Umbraco.Core.Persistence.Factories.TemplateFactory.BuildEntity(TemplateDto dto) +287 Umbraco.Core.Persistence.Repositories.TemplateRepository.MapFromDto(TemplateDto dto) +176 System.Linq.WhereSelectListIterator2.MoveNext() +141 System.Linq.WhereEnumerableIterator1.MoveNext() +233 System.Linq.Buffer1..ctor(IEnumerable 1 source) +148 System.Linq.Enumerable.ToArray(IEnumerable1 source) +106 Umbraco.Core.Persistence.Repositories.RepositoryBase2.GetAll(TId[] ids) +1642 Umbraco.Core.Persistence.Repositories.ContentTypeQueryMapper.MapContentTypeTemplates(IContentType[] contentTypes, Database db, TRepo contentTypeRepository, ITemplateRepository templateRepository, IDictionary2 associatedTemplates) +423 Umbraco.Core.Persistence.Repositories.ContentTypeQueryMapper.GetContentTypes(Int32[] contentTypeIds, Database db, TRepo contentTypeRepository, ITemplateRepository templateRepository) +213 Umbraco.Core.Persistence.Repositories.ContentTypeRepository.PerformGetAll(Int32[] ids) +100 Umbraco.Core.Persistence.Repositories.RepositoryBase2.GetAll(TId[] ids) +1560 Umbraco.Core.Persistence.Repositories.RepositoryBase2.GetByQuery(IQuery1 query) +27 Umbraco.Core.Services.ContentTypeService.GetContentType(String alias) +512 Umbraco.Core.Models.PublishedContent.PublishedContentType.CreatePublishedContentType(PublishedItemType itemType, String alias) +167 Umbraco.Core.Cache.<>c__DisplayClass91.<GetCacheItem>b__8() +15 System.Collections.Concurrent.ConcurrentDictionary2.GetOrAdd(TKey key, Func2 valueFactory) +84 Umbraco.Core.Cache.CacheProviderExtensions.GetCacheItem(ICacheProvider provider, String cacheKey, Func1 getCacheItem) +169 Umbraco.Core.Models.PublishedContent.PublishedContentType.Get(PublishedItemType itemType, String alias) +361 Umbraco.Web.PublishedCache.XmlPublishedCache.XmlPublishedContent.Initialize() +2434 Umbraco.Web.PublishedCache.XmlPublishedCache.XmlPublishedContent..ctor(XmlNode xmlNode, Boolean isPreviewing) +155 Umbraco.Web.PublishedCache.XmlPublishedCache.PublishedContentCache.ConvertToDocument(XmlNode xmlNode, Boolean isPreviewing) +50 Umbraco.Web.PublishedCache.XmlPublishedCache.PublishedContentCache.DetermineIdByRoute(UmbracoContext umbracoContext, Boolean preview, String route, Boolean hideTopLevelNode) +280 Umbraco.Web.PublishedCache.XmlPublishedCache.PublishedContentCache.GetByRoute(UmbracoContext umbracoContext, Boolean preview, String route, Nullable1 hideTopLevelNode) +258 Umbraco.Web.Routing.ContentFinderByNiceUrl.FindContent(PublishedContentRequest docreq, String route) +261 Umbraco.Web.Routing.ContentFinderByNiceUrl.TryFindContent(PublishedContentRequest docRequest) +206 System.Linq.Enumerable.Any(IEnumerable1 source, Func2 predicate) +179 Umbraco.Web.Routing.PublishedContentRequestEngine.FindPublishedContent() +392 Umbraco.Web.Routing.PublishedContentRequestEngine.FindPublishedContentAndTemplate() +272 Umbraco.Web.Routing.PublishedContentRequestEngine.PrepareRequest() +113 Umbraco.Web.UmbracoModule.ProcessRequest(HttpContextBase httpContext) +475 System.Web.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +142 System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +92