General error attempting to edit old posts

[Ian]

I got this really weird general error trying to edit an old post.

Can't copy/paste, so I'm retyping it here. What I got was:
=================================
General Error

SQL ERROR [mysqli]

Incorrect key file for table './phpbb3/gamers_posts.MYI'; try to repair it [126]

SQL

(A lot of text here from what I was trying to update)

BACKTRACE


File: includes/db/mysqli.php
Line: 163
Call: dbal->sql_error()

File: includes/functions_posting.php
Line: 1960
Call: dbal_mysqli->sql_query()

File: posting.php
Line: 1001
Call: submit_post()

==========================

Hope this helps