[Plugin: Yet Another Related Posts Plugin] YARPP error: ‘keyword_cache’ doesn’t exist

I upgraded to YARPP 2.1.2, and immediately it started giving an error at the bottom of each post.

The error says:

WordPress database error: [Table ‘avitable_blog.wp_yarpp_keyword_cache’ doesn’t exist]
select count(*) as count from wp_yarpp_keyword_cache where ID = 2098 and date > date_sub(now(),interval 400 minute)

WordPress database error: [Table ‘avitable_blog.wp_yarpp_keyword_cache’ doesn’t exist]
insert into wp_yarpp_keyword_cache (ID,body,title) values (2098,’com www zazzle http href 238409938363355960 rf george_w_bush_the_end_of_an_error_shirt br shirts tshirts 235909758295514913 insults family avitable george bush members w error’,’error’) on duplicate key update body = ‘com www zazzle http href 238409938363355960 rf george_w_bush_the_end_of_an_error_shirt br shirts tshirts 235909758295514913 insults family avitable george bush members w error’, title = ‘error’

My site is at https://www.avitable.com. Why would this upgrade make this happen? From what I can tell, it was a minor change.