Hello Community, I am using DNN 7.2.1 and Implement ISearchable to query articles to provide to the search engine. When i search on the site some articles found, but some articles not found. I open the log and see some the error log message similar as below:

[ERROR] DotNetNuke.Services.Search.Internals.LuceneControllerImpl - Search Document error: Portal ID: 0, Tab ID: 189, Module ID: 568, Mod. Def.ID: 129, Url: , Unique Key: 68E5B5C2-67C4-4D85-BB7E-32B59781E31C, Last Modified: 2014-09-12T14:00:00.0000000, Culture: vi-VN
Lucene.Net.Store.AlreadyClosedException: this IndexWriter is closed
at Lucene.Net.Index.IndexWriter.EnsureOpen(Boolean includePendingClose)
at Lucene.Net.Index.IndexWriter.EnsureOpen() at Lucene.Net.Index.IndexWriter.DeleteDocuments(Query query)
at DotNetNuke.Services.Search.Internals.LuceneControllerImpl.Delete(Query query)
at DotNetNuke.Services.Search.Internals.InternalSearchControllerImpl.DeleteSearchDocumentInternal(SearchDocument searchDocument, Boolean autoCommit)
at DotNetNuke.Services.Search.Internals.InternalSearchControllerImpl.AddSearchDocumentInternal(SearchDocument searchDocument, Boolean autoCommit)
at DotNetNuke.Services.Search.Internals.InternalSearchControllerImpl.AddSearchDocuments(IEnumerable`1 searchDocuments)

I don't know what happen.

Any one can help me?