WordPress and FeedBurner Error

Hi, I used to use FeedSmith FeedBurner Plugin for my wordpress. Today, suddenly, my feeds are giving following errors under each Post Title. I recently upgrade to WP 3.0.1 but has been a week.

Warning: call_user_func_array() [function.call-user-func-array]: First argument is expected to be a valid callback, 'Array' was given in /home/name/wordpress/wp-includes/plugin.php on line 166

I deactivated the plugin and install new plugin “FD Feedburner Plugin” and try again but still no luck. The error still persist even on FeedBurner Page.

Thanks in advance!