We did just upgraded out OTRS4 to Patchlevel 22 and receiving a 500 Internal Server Error. Perl Modules are uptodate, and we followed the Guide to update. RebuildConfig is done too. Http error logs says:
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[Wed Mar 22 14:28:57 2017] -e: (in cleanup) Can't call method "Get" on an undefined value at /opt/otrs//Kernel/System/AuthSession/DB.pm line 548.
[Wed Mar 22 14:28:57 2017] [error] Can't locate object method "CheckAgentSessionLimitPriorWarning" via package "Kernel::System::AuthSession" at /opt/otrs//Kernel/Output/HTML/NotificationAgentSessionLimit.pm line 38.\n\t(in cleanup) Can't call method "Get" on an undefined value at /opt/otrs//Kernel/System/AuthSession/DB.pm line 548.\n
Thanks many
Oli