auth.log error

how can I deactivate this error in the auth.log

Feb 12 17:37:35 alpha postfix/smtpd[1472]: sql_select option missing
Feb 12 17:37:35 alpha postfix/smtpd[1472]: auxpropfunc error no mechanism available
Feb 12 17:37:35 alpha postfix/smtpd[1472]: _sasl_plugin_load failed on sasl_auxprop_plug_init for plugin: sql

I have read that you could deactivate this message with adding

auxprop_plugin:

to /etc/postfix/sasl/smtpd.conf
by leaving it empty it should not try to load the plugin.
but when I do this I get the following error to the mail.log

postfix/smtpd[7207]: warning: SASL per-process initialization failed: generic failure
postfix/smtpd[7207]: fatal: SASL per-process initialization failed
postfix/master[17704]: warning: process /usr/lib/postfix/smtpd pid 7207 exit status 1
postfix/master[17704]: warning: /usr/lib/postfix/smtpd: bad command startup -- throttling
postfix/smtpd[7212]: warning: SASL per-process initialization failed: generic failure

any ideas?
Hm I mean we use Dovecot as IMAP/POP3 server. Then the SASL config for postfix isn't realy necesserary or am I wrong?
Could i also leave the TLS config out of the main.cf isn't that also handled by Dovecot? For example
smtpd_tls_cert_file
smtpd_tls_key_file
is set in Dovecot and in Postfix. Is that realy needed?

Status: 
Closed (fixed)