what is that meaning in pam_mysql ??

[Temp]

when after I login imap account, there is so much logs,
and how to get rid of them ??
I seach google, but no exact answer for it.

Mar 14 08:55:19 mx saslauthd[13604]: pam_mysql: error: sqllog set but
logmsgcolumn not set
Mar 14 08:55:19 mx saslauthd[13604]: pam_mysql: error: sqllog set but
logusercolumn not set
Mar 14 08:55:19 mx saslauthd[13604]: pam_mysql: error: sqllog set but
loghostcolumn not set
Mar 14 08:55:19 mx saslauthd[13604]: pam_mysql: error: sqllog set but
logtimecolumn not set
Mar 14 08:55:19 mx saslauthd[13606]: pam_mysql: error: sqllog set but
logtable not set


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