Error PHP Module 'redis'

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Hello! Enroll persistent errors in the log related to Module 'redis' . Can anyone met such.
Error PHP Module 'redis' already loaded at Unknown#0

Expected behaviour

Actual behaviour
Slow running user search through LDAP

Server configuration
Operating system: Ubuntu Server 15.10
Web server:Apache/2.4.12
Database:mariaDB 10.0.25
PHP version:PHP 5.6.11
ownCloud version (see ownCloud admin page): ownCloud 9.0.8 (stable)
Updated from an older ownCloud or fresh install:
Special configuration (external storage - nas, external authentication- ldap, reverse proxy - no, server-side-encryption-no):

ownCloud log (data/owncloud.log)

Please paste possible errors in the following code block, see https://central.owncloud.org/t/how-to-find-webserver-or-oc-logfile-enable-php-logfile/808 for more info

Integrity status for oC9+

Login as admin user into your ownCloud and access
http://example.com/index.php/settings/integrity/failed
paste the results here.

http://www.somacon.com/p520.php