Roundcube PHP Deprecated: Non-static method Auth_SASL

Hi,

I have this error in logo file Roundcube:

[14-Nov-2016 20:49:08 Europe/Berlin] PHP Deprecated: Non-static method Auth_SASL::factory() should not be called statically in /usr/share/psa-roundcube/program/lib/Roundcube/rcube_imap_generic.php on line 578

I see this solution to plesk 12.5 https://kb.plesk.com/en/129526 but i can´t find this directory in Onix /usr/share/psa-roundcube/plugins/filters/filters.php

Someone known the right...

Roundcube PHP Deprecated: Non-static method Auth_SASL