Search functionality not working? EventCalendar3?

I’m finishing up a website for a client, and when I went to test my Search bar, I realized it’s not working! Here is the message that comes up on the Search results page:

WordPress database error: [Table 'assisiwordpress.wp_post2cat' doesn't exist]
SELECT SQL_CALC_FOUND_ROWS wp_posts.* FROM wp_posts LEFT JOIN wp_post2cat ec3_post2cat ON ec3_post2cat.post_id=id LEFT JOIN wp_ec3_schedule ec3_sch ON ec3_sch.post_id=id AND ec3_sch.end>='2007-11-03 00:00:00' WHERE 1=1 AND (((post_title LIKE '%testing%') OR (post_content LIKE '%testing%'))) AND post_type = 'post' AND (post_status = 'publish') AND (ec3_sch.post_id IS NOT NULL OR ec3_post2cat.category_id!=11) ORDER BY post_date DESC LIMIT 0, 1

I think it might have something to do with EventCalendar3, which I have activated and is being used on the main page. Thanks for any suggestions!