How to restore from backup when there is always a code -50 error ?

I recently upgraded my iphone 4 from OS4 to OS5. 
Everything went well until the phone prompts me to connect to itunes (the cable to itunes picture).  itunes keeps on giving an error saying restore cannot be done and the code is -50.
I'm thinking of "restoring from backup" option in itunes, but is there a possibility of the error coming out again ?  Currently I have the apps recovered, but not the contact list.

After reading your post I had a look at "man
reconstruct". I'm not clear about the "f" flag, you
suggest it, and the man page says "useful for
restoring backups" - but the example on the man page
does not use the "f" flag. I'm not sure whether I
should / shouldn't use it.
Up to you to decide whether to trust the man page or me
Just kidding. The -f flag will make sure subfolders containing messages will be take into account as well.
But you are saying
that if I just reconstruct the ONE mailbox then it is
only that one where I need to fix the ACLs? That is
much better!!
Yes, just that one. (Unless your database is already broken for some reason and you need to do a full reconstruct, but you should see this in the logs)

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