we migrated our site dev.cms.molpower.com form v7.1 to v8.

After migration we noticed, File search facility stopped working. I saw follwing error in the "Schedule History" screen

"Search: File Crawler

Scanning for files changed since: 5/28/2015 12:45 PM

File Crawler Unable to Finish, Error: Value cannot be null. Parameter name: stream

File Crawler Finished"

Event viewer also represent following error.

[

Message:File Crawler Unable to Finish, Error: Value cannot be null. Parameter name: stream

StackTrace:

InnerMessage:Value cannot be null. Parameter name: stream

InnerStackTrace:

at DotNetNuke.Services.FileSystem.FolderProvider.GetHashCode(IFileInfo file, Stream fileContent)

at DotNetNuke.Services.FileSystem.FolderProvider.GetHashCode(IFileInfo file)

at DotNetNuke.Services.FileSystem.FileInfo.get_SHA1Hash()

at DotNetNuke.Professional.SearchCrawler.FileCrawling.FileCrawlerController.CreateIndexedFile(IFileInfo fileInfo, Boolean bodyIndexed, Int32 scheduleId)

at DotNetNuke.Professional.SearchCrawler.FileCrawling.FileCrawlerController.IndexDirectory(ISearchCrawlerPortalContext searchCrawlerPortalContext, IFolderInfo folderInfo)

at DotNetNuke.Professional.SearchCrawler.FileCrawling.FileCrawlerController.IndexPortalDirectory(ISearchCrawlerPortalContext searchCrawlerPortalContext)

at DotNetNuke.Professional.SearchCrawler.FileCrawling.FileCrawlerController.IndexPortalDirectories(ISearchCrawlerContext searchCrawlerContext)

at DotNetNuke.Professional.SearchCrawler.FileCrawler.FileCrawler.FileCrawlerThread()

]

Regards

Bibhas