Issue 1:

Browse SharePoint Central Administration --> Shared Services --> Search Administration --> Crawl Rule

Attempt to Add \ Edit \ Delete of Crawl Rule.

Issue 2:

Browse SharePoint Central Administration --> Shared Services --> Search Administration --> Content Source

Attempt to Add \ Edit the Crawl Schedules to Content Source

Issue 3:

Browse SharePoint Central Administration --> Shared Services --> Search Administration --> Reset all Content Source

When you attempt to perform any of the above operation you might receive following error

Microsoft.Office.Server.Search.Administration.MSSITLB.IGatherApplication2.ValidateVersionForWrite(Int32 lLastVersion, Int32& plVersionOut)

at Microsoft.Office.Server.Search.Administration.SearchApi.<>c__DisplayClassaa.<UpdateCrawlRule>b__a9()

at Microsoft.Office.Server.Search.Administration.SearchApi.RunOnServer[T](CodeToRun`1 remoteCode, CodeToRun`1 localCode, Boolean useCurrentSecurityContext, Int32 versionIn)

 

Resolution:

Log on to the server which has index .

Click on Start –> Run  and type "Services.msc"

Locate Office SharePoint Server Search and then Restart it.

Or

Open Command Prompt and then execute below

Net Stop Osearch && Net Start Osearch