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System.NullReferenceException: Object reference not set to an instance of an object. at Lucene.Net.Index.IndexWriter.Unlock(Directory directory) at Smartstore.MegaSearch.Lucene.LuceneIndex.Init() at Smartstore.MegaSearch.Lucene.LuceneIndex.get_Exists() --- End of stack trace from previous location --- at Smartstore.ExceptionExtensions.ReThrow(Exception exception) at Smartstore.MegaSearch.Lucene.LuceneIndex.get_Exists() at Smartstore.Core.Catalog.Search.CatalogSearchService.SearchAsync(CatalogSearchQuery searchQuery, Boolean direct) at Smartstore.Web.Controllers.SearchController.Search(CatalogSearchQuery query)