Plesk 10.3.1 fails PHP Fatal error: Class 'vz' not found in /usr/local/psa/admin/pli

[rescarcega]

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PRODUCT, VERSION, MICROUPDATE, OPERATING SYSTEM, ARCHITECTURE
Plesk 10.3.1, Linux Centos 5 2.6.18-194.26.1.el5, i386
PROBLEM DESCRIPTION

I'm getting this error by mail:

subject: Cron <xxxx@myserver> /usr/local/psa/libexec/modules/watchdog/cp/clean-sysstats

PHP Fatal error: Class 'vz' not found in /usr/local/psa/admin/plib/PleskException.php on line 22

And the server stops responding.


STEPS TO REPRODUCE

ACTUAL RESULT

The server has to be rebooted.

EXPECTED RESULT

ANY ADDITIONAL INFORMATION
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[IgorG]

What about upgrade to latest version in 10.x - 10.4.4 or to latest version 11.0.9?