Database error

From Indiapensions

A database query syntax error has occurred. This could be because of an illegal search query (see Searching Iief), or it may indicate a bug in the software. The last attempted database query was:

SELECT COUNT(user_id) AS total FROM user

from within function "wfSpecialStatistics". MySQL returned error "1016: Can't open file: 'user.MYI' (errno: 145)".