Fold Category List plugin not working at all in wp 2.3

Hi,
Little help needed.

I do as told here.

simply replace the code fragment that looks like this
<?php wp_list_cats ($args); ?>
with this:
<?php wswwpx_fold_category_list ($args); ?>
You can even use the same arguments as in the original call.

Wp just spews out this error message. Is it not compatible with wp 2.3?

WordPress database error: [Table 'wordpress.wp_categories'
doesn't exist]
SELECT cat_ID, cat_name, category_nicename,
category_description, category_parent FROM wp_categories
WHERE cat_ID > 0 ORDER BY cat_ID asc

WordPress database error: [Table 'wordpress.wp_categories'
 doesn't exist]
SELECT cat_ID, COUNT(wp_post2cat.post_id) AS cat_count FROM
 wp_categories INNER JOIN wp_post2cat ON (cat_ID =
category_id) INNER JOIN wp_posts ON (ID = post_id) WHERE
post_status = 'publish' AND post_type = 'post' AND
post_date_gmt < '2007-11-15 13:06:23' GROUP BY category_id