I'm reading now about 2 hours Threads to fix my issue, but I can't find anything suitable

crond is running:
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crond.service - Command Scheduler
Loaded: loaded (/usr/lib/systemd/system/crond.service; enabled; vendor preset: enabled)
Active: active (running) since Fri 2015-06-05 15:58:47 UTC; 2 days ago
Main PID: 22455 (crond)
CGroup: /system.slice/crond.service
└─22455 /usr/sbin/crond -n
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[tobias@otrs2 ~]$ ls -al /opt/otrs/var/cron/
total 60
drwxrwsr-x 2 otrs apache 4096 Jun 5 16:40 .
drwxrwsr-x 11 otrs apache 4096 Jun 5 16:40 ..
-rw-rw---- 1 otrs apache 52 May 11 14:42 aaa_base
-rw-rw---- 1 otrs apache 179 May 11 14:42 cache
-rw-rw---- 1 otrs apache 180 May 11 14:42 fetchmail
-rw-rw---- 1 otrs apache 106 May 11 14:42 generate_dashboard_stats
-rw-rw---- 1 otrs apache 295 May 11 14:42 generic_agent
-rw-rw---- 1 otrs apache 106 May 11 14:42 generic_agent-database
-rw-rw---- 1 otrs apache 99 May 11 14:42 pending_jobs
-rw-rw---- 1 otrs apache 101 May 11 14:42 postmaster
-rw-rw---- 1 otrs apache 98 May 11 14:42 postmaster_mailbox
-rw-rw---- 1 otrs apache 80 May 11 14:42 rebuild_ticket_index
-rw-rw---- 1 otrs apache 87 May 11 14:42 scheduler_watchdog
-rw-rw---- 1 otrs apache 123 May 11 14:42 session
-rw-rw---- 1 otrs apache 107 May 11 14:42 unlock
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-rw-rw---- 1 otrs apache 107 May 11 14:42 unlock
[tobias@otrs2 ~]$ sudo /opt/otrs/bin/Cron.sh start tobias
[sudo] password for tobias:
/home/tobias
Cron.sh - start/stop OTRS cronjobs
Copyright (C) 2001-2012 xxx, http://otrs.org/
(using /opt/otrs) done
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[tobias@otrs2 ~]$ systemctl restart crond.service
Failed to restart crond.service: The name org.freedesktop.PolicyKit1 was not provided by any .service files

Regards,
alvarex