Create a folder in your home directory and give permissions (read and write) to everyone. Then you’ll have to set “upload_tmp_dir” to the folder created before in your php.ini (I can’t tell you, where this file is located in Xampp on Mac OS X, sorry). The value for upload_tmp_dir must be an absolute path. And don’t forget to remove the ‘;’ in front of upload_tmp_dir.

HTH & HAND
Steffen

That post from Dwight Jack is no longer online and your explanation is a little… ‘concise’?

Could you post some more step-by-step info about how to fix this error. I’m using WP 2.8 on Mac OS X Xampp.