Error actualizar de 1.1.18 a 1.1.20

Tratando de actualizar de la version 1.1.18 a la version 1.1.20 ,obtengo error del instalador de la version 1.1.20, lo siguiente:

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[ERROR]

Error hile performing step:

Rebuilding customers files

Error was:

main::setupRebuildCustomerFiles:

[ERROR]

main::_process: Error while processing 1, ClamAV, tochange.
main::_process: See /var/log/imscp/Plugin_module_ClamAV.log for more details.

[ERROR]
iMSC::File::get: Unable to open /etc/default/clamav-milter: No such file or directory
Plugin::ClamAV::_modifyClamavMilterDefaultConfig: Unable to read /etc/default/clamva-milter

Please, post on http://i-mscp.net/forum to get any help.
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Distribucion: GNU/DEBIAN Wheezy 7.7
Apache: 2.2.22
PHP: 5.4.35
i-IMSCP: 1.1.18
Dovecot: 2.1.7
Proftpd: 1.3a
Plugin - ClamAV: Version 0.0.1

Al final en el sitio web, obtengo:

An unexpected error occured
An unexpected error occurred. Please contact your administrator.

Saludos.

En el log del archivo /var/log/imscp/Plugin_module_ClamAV.log aparece este error:

[Thu Dec 11 11:13:34 2014] [debug] iMSCP::EventManager::register: Registering listener on the 'afterHttpdBuildConf' event from (eval)
[Thu Dec 11 11:13:34 2014] [debug] Modules::Plugin::_exec: Executing Plugin::ClamAV::disable() action
[Thu Dec 11 11:13:34 2014] [debug] iMSCP::Execute::execute: Executing command: postconf smtpd_milters
[Thu Dec 11 11:13:34 2014] [debug] iMSCP::Execute::getExitCode: External command exited with value 0
[Thu Dec 11 11:13:34 2014] [debug] Plugin::ClamAV::_modifyPostfixMainConfig: smtpd_milters =
[Thu Dec 11 11:13:34 2014] [debug] iMSCP::File::save: Saving file /etc/postfix/main.cf
[Thu Dec 11 11:13:34 2014] [debug] iMSCP::Config::_init: Tying /etc/imscp/postfix/postfix.data
[Thu Dec 11 11:13:34 2014] [debug] iMSCP::Config::_loadConfig: Loading /etc/imscp/postfix/postfix.data
[Thu Dec 11 11:13:34 2014] [debug] iMSCP::Config::_parseConfig: Parsing /etc/imscp/postfix/postfix.data
[Thu Dec 11 11:13:34 2014] [debug] Modules::Plugin::_exec: Executing Plugin::ClamAV::change() action
[Thu Dec 11 11:13:34 2014] [error] iMSCP::File::get: Unable to open /etc/default/clamav-milter: No such file or directory
[Thu Dec 11 11:13:34 2014] [error] Plugin::ClamAV::_modifyClamavMilterDefaultConfig: Unable to read /etc/default/clamav-milter

Saludos.

Hello Nuxwin, thanks by response.

Sorry, what is the procedure to make that change?

Thanks.

Mil gracias, por la ayuda, luego de esto voy a actualizar a la version mas reciente y liberada 1.2.x.

Saludos.