Step 2 Upgrade – php file errors
Upgrading from 2.1 to 2.5 – I removed the old wp-includes and wp-admin and uploaded the new folders.
When I went to the page on my site equivalent to
Warning: Invalid argument supplied for foreach() in …/wp-includes/query.php on line 683
Fatal error: Call to undefined function update_object_term_cache() in …/wp-includes/post.php on line 2745
I tested this out on another version first, going from 2.2 and it worked fine.
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