Hello and please help to find a solution to correct the following errors on my site

THREAD ID:16

TYPE:DotNetNuke.Services.Search.SearchEngineScheduler

EXCEPTION:Lock obtain timed out: NativeFSLock@H:\Antik-TV Shop\App_Data\Search\write.lock

and one more

Message:

Lucene.Net.Store.LockObtainFailedException: Lock obtain timed out: NativeFSLock@H:\Antik-TV Shop\App_Data\Search\write.lock
at Lucene.Net.Store.Lock.Obtain(Int64 lockWaitTimeout)
at Lucene.Net.Index.IndexWriter.Init(Directory d, Analyzer a, Boolean create, IndexDeletionPolicy deletionPolicy, Int32 maxFieldLength, IndexingChain indexingChain, IndexCommit commit)
at Lucene.Net.Index.IndexWriter.Init(Directory d, Analyzer a, IndexDeletionPolicy deletionPolicy, Int32 maxFieldLength, IndexingChain indexingChain, IndexCommit commit)
at Lucene.Net.Index.IndexWriter..ctor(Directory d, Analyzer a, MaxFieldLength mfl)
at DotNetNuke.Services.Search.Internals.LuceneControllerImpl.get_Writer()
at DotNetNuke.Services.Search.Internals.LuceneControllerImpl.Delete(Query query)
at DotNetNuke.Services.Search.Internals.InternalSearchControllerImpl.DeleteAllDocuments(Int32 portalId, Int32 searchTypeId)
at DotNetNuke.Services.Search.SearchEngine.DeleteOldDocsBeforeReindex(DateTime startDate)
at DotNetNuke.Services.Search.SearchEngineScheduler.DoWork()