Sounds to me like the edit-form-advanced.php file could be corrupt. Did you upgrade by uploading all the WordPress files via FTP? Sometimes this isn’t the most reliable way (even if it’s the only method available – I know it is for me).
I am, of course, assuming that the error message means that the error is with that file and not with the one where the function it’s trying to call resides…
I’d try re-uploading this file individually and overwriting the one that’s there. See if that helps. If not, try uploading the whole wp-admin folder again, and if not *that* then the rest of the core files.
wp_category_checklist() is defined in wp-admin/includes/template.php, so that file is missing. Best is to delete both wp-admin and wp-includes directories and upload fresh copies.
Thanks to both of you…I hope that helps. Iain, I think my webhost allows me to upload via it’s backend thingy (yes, I speak tech) so I’ll try to do that.
Whoo-hoo! You guys rock…the error message is gone AND my editors are back. Thanks so much.
FM — do you know which files were causing the problem, or did you just replace the two directories wholesale?
Replacing wp-includes directories fixed it for us!
