We're getting the given key error relating to an examine index on one of our sites.  I believe this is due to the index not being rebuilt correctly however I have no idea how to fix it and my colleague that might is on holiday just now.

We've tried republishing the pages and rebuilding the index and also tried deleting the index folder when the site is stopped so it is rebuilt upon startup however it is still not working.  I do seem to be getting these kind of errors when rebuilding the index

Error indexing queue items,Permanent is not a valid value for Single., IndexSet: JobIndexSet

Will these stop the index being rebuilt correctly or does it process the other properties and just skip that one.

Can anyone provide any other suggestions of what the problem could be and how to fix it.