Hello.

Every now and then i get this error. It's only a few weeks ago i installed umbraco. It has 2 content nodes, and around 500 media nodes.

Any ideas what's wrong?

 2015-12-21 14:31:32,945 [P70380/D13/T1] WARN  Umbraco.Core.Sync.DatabaseServerMessenger - No last synced Id found, this generally means this is a new server/install. The server will rebuild its caches and indexes and then adjust it's last synced id to the latest found in the database and will start maintaining cache updates based on that id
 2015-12-21 14:31:32,961 [P70380/D13/T1] INFO  umbraco.content - Load Xml from file...
 2015-12-21 14:31:32,961 [P70380/D13/T1] INFO  umbraco.content - Loaded Xml from file.
 2015-12-21 14:31:32,961 [P70380/D13/T1] INFO  umbraco.content - Loading content from database...
 2015-12-21 14:31:34,273 [P70380/D13/T1] ERROR Umbraco.Core.CoreBootManager - An error occurred running OnApplicationStarted for handler Umbraco.Web.BatchedDatabaseServerMessengerStartup
Lucene.Net.Store.LockObtainFailedException: Lock obtain timed out: NativeFSLock@d:\web\localuser\jonask.net\public_html\App_Data\TEMP\ExamineIndexes\NT20\InternalMember\Index\write.lock: System.IO.IOException: The process cannot access the file 'd:\web\localuser\jonask.net\public_html\App_Data\TEMP\ExamineIndexes\NT20\InternalMember\Index\write.lock' because it is being used by another process.
   at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
   at System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy, Boolean useLongPath, Boolean checkHost)
   at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access)
   at Lucene.Net.Store.NativeFSLock.Obtain() ---> System.IO.IOException: The process cannot access the file 'd:\web\localuser\jonask.net\public_html\App_Data\TEMP\ExamineIndexes\NT20\InternalMember\Index\write.lock' because it is being used by another process.
   at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
   at System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy, Boolean useLongPath, Boolean checkHost)
   at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access)
   at Lucene.Net.Store.NativeFSLock.Obtain()
   --- End of inner exception stack trace ---
   at Lucene.Net.Store.Lock.Obtain(Int64 lockWaitTimeout)
   at Lucene.Net.Index.IndexWriter.Init(Directory d, Analyzer a, Boolean create, Boolean closeDir, IndexDeletionPolicy deletionPolicy, Boolean autoCommit, Int32 maxFieldLength, IndexingChain indexingChain, IndexCommit commit)
   at Lucene.Net.Index.IndexWriter..ctor(Directory d, Analyzer a, Boolean create, MaxFieldLength mfl)
   at Examine.LuceneEngine.Providers.LuceneIndexer.CreateIndexWriter()
   at UmbracoExamine.BaseUmbracoIndexer.CreateIndexWriter()
   at Examine.LuceneEngine.Providers.LuceneIndexer.EnsureIndex(Boolean forceOverwrite)
   at Examine.LuceneEngine.Providers.LuceneIndexer.RebuildIndex()
   at UmbracoExamine.UmbracoContentIndexer.RebuildIndex()
   at Examine.ExamineManager._RebuildIndex()
   at Umbraco.Web.WebBootManager.<InitializeResolvers>b__c()
   at Umbraco.Core.Sync.DatabaseServerMessenger.Initialize()
   at Umbraco.Core.Sync.DatabaseServerMessenger.Boot()
   at Umbraco.Web.BatchedDatabaseServerMessenger.Startup()
   at Umbraco.Web.BatchedDatabaseServerMessengerStartup.ApplicationStarted(UmbracoApplicationBase umbracoApplication, ApplicationContext applicationContext)
   at Umbraco.Core.ApplicationEventHandler.OnApplicationStarted(UmbracoApplicationBase umbracoApplication, ApplicationContext applicationContext)
   at Umbraco.Core.CoreBootManager.<Complete>b__8(IApplicationEventHandler x)
 2015-12-21 14:31:34,273 [P70380/D13/T1] ERROR Umbraco.Core.UmbracoApplicationBase - An unhandled exception occurred
Lucene.Net.Store.LockObtainFailedException: Lock obtain timed out: NativeFSLock@d:\web\localuser\jonask.net\public_html\App_Data\TEMP\ExamineIndexes\NT20\InternalMember\Index\write.lock: System.IO.IOException: The process cannot access the file 'd:\web\localuser\jonask.net\public_html\App_Data\TEMP\ExamineIndexes\NT20\InternalMember\Index\write.lock' because it is being used by another process.
   at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
   at System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy, Boolean useLongPath, Boolean checkHost)
   at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access)
   at Lucene.Net.Store.NativeFSLock.Obtain() ---> System.IO.IOException: The process cannot access the file 'd:\web\localuser\jonask.net\public_html\App_Data\TEMP\ExamineIndexes\NT20\InternalMember\Index\write.lock' because it is being used by another process.
   at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
   at System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy, Boolean useLongPath, Boolean checkHost)
   at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access)
   at Lucene.Net.Store.NativeFSLock.Obtain()
   --- End of inner exception stack trace ---
   at Lucene.Net.Store.Lock.Obtain(Int64 lockWaitTimeout)
   at Lucene.Net.Index.IndexWriter.Init(Directory d, Analyzer a, Boolean create, Boolean closeDir, IndexDeletionPolicy deletionPolicy, Boolean autoCommit, Int32 maxFieldLength, IndexingChain indexingChain, IndexCommit commit)
   at Lucene.Net.Index.IndexWriter..ctor(Directory d, Analyzer a, Boolean create, MaxFieldLength mfl)
   at Examine.LuceneEngine.Providers.LuceneIndexer.CreateIndexWriter()
   at UmbracoExamine.BaseUmbracoIndexer.CreateIndexWriter()
   at Examine.LuceneEngine.Providers.LuceneIndexer.EnsureIndex(Boolean forceOverwrite)
   at Examine.LuceneEngine.Providers.LuceneIndexer.RebuildIndex()
   at UmbracoExamine.UmbracoContentIndexer.RebuildIndex()
   at Examine.ExamineManager._RebuildIndex()
   at Umbraco.Web.WebBootManager.<InitializeResolvers>b__c()
   at Umbraco.Core.Sync.DatabaseServerMessenger.Initialize()
   at Umbraco.Core.Sync.DatabaseServerMessenger.Boot()
   at Umbraco.Web.BatchedDatabaseServerMessenger.Startup()
   at Umbraco.Web.BatchedDatabaseServerMessengerStartup.ApplicationStarted(UmbracoApplicationBase umbracoApplication, ApplicationContext applicationContext)
   at Umbraco.Core.ApplicationEventHandler.OnApplicationStarted(UmbracoApplicationBase umbracoApplication, ApplicationContext applicationContext)
   at Umbraco.Core.CoreBootManager.<Complete>b__8(IApplicationEventHandler x)
   at Umbraco.Core.EnumerableExtensions.ForEach[TItem](IEnumerable`1 items, Action`1 action)
   at Umbraco.Core.CoreBootManager.Complete(Action`1 afterComplete)
   at Umbraco.Web.WebBootManager.Complete(Action`1 afterComplete)
   at Umbraco.Core.UmbracoApplicationBase.StartApplication(Object sender, EventArgs e)
   at Umbraco.Core.UmbracoApplicationBase.Application_Start(Object sender, EventArgs e)
 2015-12-21 14:31:37,211 [P70380/D13/T17] INFO  umbraco.content - Save Xml to file...
 2015-12-21 14:31:37,211 [P70380/D13/T10] INFO  umbraco.content - Saved Xml to file.
 2015-12-21 14:31:44,273 [P70380/D13/T30] ERROR UmbracoExamine.DataServices.UmbracoLogService - Provider=InternalMemberIndexer, NodeId=-1
System.Exception: Cannot index queue items, the index is currently locked,, IndexSet: InternalMemberIndexSet
 2015-12-21 14:31:44,273 [P70380/D13/T30] ERROR UmbracoExamine.DataServices.UmbracoLogService - Provider=InternalIndexer, NodeId=-1
System.Exception: Cannot index queue items, the index is currently locked,, IndexSet: InternalIndexSet
 2015-12-21 14:31:44,273 [P70380/D13/T30] ERROR UmbracoExamine.DataServices.UmbracoLogService - Provider=ExternalIndexer, NodeId=-1
System.Exception: Cannot index queue items, the index is currently locked,, IndexSet: ExternalIndexSet