We are getting all sorts of errors in Sitefinity and it appears to be a problem with the Search section. I checked your forums and saw that someone found a solution. They added NETWORK SERVICE to the security for APP_DATA and deleted and recreated the index. I added NETWORK SERVICE as a user and that didn't fix anything, so I thought I would try deleting and recreating the index. Now, I'm getting this error. We are getting all sorts of errors on production. I really need some help with this as soon as possible.