Quote:
Originally Posted by armymomnj
I fixed the problem. I updated my google sitemaps plugin but evidently it didn't update. I deleted it altogether then uploaded the updated one again... activated it and all is fine now.
Thanks anyway Roxy 
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That sounds about right. Usually an install of Wordpress without outside plugins will not have any issues upgrading. Plugins usually cause any rare problems.
But then there's what Wordpress has to say about those errors:
FAQ Troubleshooting WordPress Codex
Spaces... so I'd say the top reasons would be plugins and lots of custom editing that can create small mistakes.