MySQL Fatal Error

MySQL Error!
------------------------

The Error returned was:
Can't create/write to file '/tmp/#sql_54e4_0.MYI' (Errcode: 28)

Error Number:
1

SELECT id, title, date, category, alt_name, short_story, flag FROM el_post WHERE MATCH (title, short_story, full_story, xfields) AGAINST ('Hideo KOBAYASHI - Listen To The Voice EP Hideo KOBAYASHI - Listen To The Voice EPArtist: Hideo KOBAYASHI  Title: Listen To The Voice EPLabel:  New World JapanFormat: 320 mp3Released: 22 Jul 2009Genre: Deep HousehotfileTracklist:  1.   Listen To The Voice (Big Room Dub)     [ 5:45]                2.   Listen To The Voice (Big Room          [ 5:47]                      Instrumental)                                   3.   Listen To The Voice (Extended Club     [ 6:48]                      Mix)                                            4.   Listen To The Voice (Extended Club Mix [ 6:48]                      Instrumental)                                   5.   Listen To The Voice (Love from Nagano  [ 4:50]                      Mix)                                            6.   Listen To The Voice (Original Mix)     [ 5:46]                7.   Listen To The Voice (Original Mix      [ 5:47]                      Instrumental)                                  8.   Listen To The Voice (RaFa\'s            [ 6:09]                      Dubstrumental)                                  9.   Listen To The Voice (RaFa\'s Voice Dub) [ 6:09]                10.  Listen To The Voice (Rasmus Faber      [ 8:19]                      Remix)                                           11.  Listen To The Voice (Rasmus Faber      [ 8:19]                     Remix Instrumental)                              12.  Listen To The Voice (Skylark Boogie    [ 5:38]                     mix) ') AND id != 3639 AND approve='1' AND date < '2013-05-18 14:51:08'ORDER BY RAND() LIMIT 5