If you are like many of us using some plug-ins like nofollow links in post or Google analytics(these are the plugin that use the is_site_admin() function).
You should be ready to be surprised to find that the is_site_admin() function is now obsolete. After a successful upgrade from wordpress 2.7, when you re-login to wordpress 2.8 you get following error
Fatal error: Call to undefined function is_site_admin() in ….
Here is how I fixed this…
Delete the Plug-in folder after downloading it via FTP
Find the phrase is_site_admin() in the plugin files
Replace it with is_admin()
Upload it again to server via FTP
Login to WordPress admin, Activate the plugin if it is de-activated.
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