When ticket comes or on some events, the page throws error Contact your system admin.
The Agent gets notification, and then on web browser the error comes.
If I delete cache, rebuild config and restart Apache the error goes.
The Folder /opt/otrs/var has 777 permission.
I had installed and uninstalled ITSM module and the error comes.
Apache Logs
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The following log comes in apache.
Fri Mar 15 15:12:07 2013] -e: Use of uninitialized value in concatenation (.) or string at /opt/otrs//Kernel/Output/HTML/DashboardCalendar.pm line 145.
[Fri Mar 15 15:14:14 2013] -e: Use of uninitialized value in concatenation (.) or string at /opt/otrs/bin/cgi-bin/../../Kernel/Output/HTML/DashboardCalendar.pm line 145.
ERROR: OTRS-CGI-10 Perl: 5.8.8 OS: linux Time: Fri Mar 15 15:15:16 2013
Message: Need TicketID!
RemoteAddress: 10.115.1.54
RequestURI: /otrs/index.pl?Action=AgentTicketLock;Subaction=Unlock;TicketID=27;ChallengeToken=cb759384ba97697d5bf1de0586140c97;
Traceback (22573):
Module: Kernel::System::Ticket::Event::NagiosAcknowledge::Run (v1.12) Line: 50
Module: Kernel::System::EventHandler::EventHandler (v1.17) Line: 245
Module: Kernel::System::Ticket::TicketLockSet (v1.587) Line: 3595
Module: Kernel::Modules::AgentTicketLock::Run (v1.19) Line: 106
Module: Kernel::System::Web::InterfaceAgent::Run (v1.73) Line: 866
Module: ModPerl::ROOT::ModPerl::Registry::opt_otrs_bin_cgi_2dbin_index_2epl::handler (unknown version) Line: 46
Module: (eval) (v1.94) Line: 204
Module: ModPerl::RegistryCooker::run (v1.94) Line: 204
Module: ModPerl::RegistryCooker::default_handler (v1.94) Line: 170
Module: ModPerl::Registry::handler (v1.99) Line: 31
[Fri Mar 15 15:16:15 2013] -e: Use of uninitialized value in concatenation (.) or string at /opt/otrs/bin/cgi-bin/../../Kernel/Output/HTML/DashboardCalendar.pm line 145.
[Fri Mar 15 15:18:00 2013] [error] mkdir /opt/otrs/var/tmp/CacheFileStorable/CacheInternalQueue/7/1: Permission denied at /opt/otrs/bin/cgi-bin/../../Kernel/System/Cache/FileStorable.pm line 79.\n
[Fri Mar 15 15:18:00 2013] [error] [client 10.115.1.54] client denied by server configuration: /opt/otrs/favicon.ico
[Fri Mar 15 15:18:05 2013] [error] mkdir /opt/otrs/var/tmp/CacheFileStorable/CacheInternalTicket/5/b: Permission denied at /opt/otrs/bin/cgi-bin/../../Kernel/System/Cache/FileStorable.pm line 79.\n
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