[rt-users] error on preferences page after upgrading from 3.8.5 to 3.8.6

[slamp slamp]

Error on preferences page:

Can't locate object method "date_format_full" via package
"DateTime::Locale::en" at /opt/rt3/bin/../lib/RT/Date.pm line 659.

Error in the error_log:

FastCGI: server "/opt/rt3/bin/mason_handler.fcgi" stderr: Use of
uninitialized value in hash element at
/opt/rt386/share/html/Widgets/Form/Select line 120., referer:
https://rt.warpdrive.net/Admin/

Running on CentOS 4.8 and mysql-4.1.22 and httpd-2.0.52