As the error seems to be related to workflows and the ability to clone, I can think of the following possible causes, depending on the action which triggered the error:
Reviewing the underlying workflow in edit mode may provide a clue.
If you do not find anything else, I'd suggest you to create a ticket with Atlassian Support:
...PermissionsStartOnly=true User=www-data Group=www-data ExecStart=/opt/jira/bin/startup.sh ExecStop=/opt/jira/bin/shutdown.sh TimeoutStartSec=120 TimeoutStopSec=600 PrivateTmp=true [Install] WantedBy...
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