[Plugin: Search Simple Fields] Doesn't do anything

So…I’ve set up both plugins, Simple fields and this one Simple Fields search. I’ve added a few posts that have simple fields content in them, and I’ve selected those to be ‘searchable’.

I’ve also added the block of code that I’m supposed to put in my functions.php (which has a missing endif btw).

So I do a search for the text I entered in the custom fields, and no posts are returned.

http://wordpress.org/extend/plugins/search-simple-fields/