Apr 08 2008
WordPress 2.5 Upgrade Problem
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After upgrading from an earlier version of WordPress to its most recent release 2.5, some people got this error message when adding a picture:
- Fatal error: Call to undefined function wp_constrain_dimensions.
This problem is caused by a corrupted upgrading process. To solve the problem, you must overwrite the old files (It is recommended to delete the old files first, then upload new ones) under the wp-admin and wp-includes folders. For root folder (where your wp-configure.php file resides), leave wp-configure.php intact but overwrite all other files.
For more detailed upgrade instructions, read WP’s Three Step Upgrade.
