Search function on the blink?

[Pies4shaw]

I've been trying to find an old post and have been getting this message - or something similar - on a number of search results:

Could not obtain matched posts list

DEBUG MODE

SQL Error : 144 Table './magpies_phpBB/magpies_phpBB_search_wordmatch' is marked as crashed and last (automatic?) repair failed

SELECT m.post_id FROM magpies_phpBB_search_wordlist w, magpies_phpBB_search_wordmatch m WHERE w.word_text LIKE 'total' AND m.word_id = w.word_id AND w.word_common <> 1

Line : 402
File : search.php

Haven't seen this before and it looks like the wordmatch function is cactus.