I found the solution in this thread: https://groups.google.com/forum/m/#!topic/jenkinsci-users/9I4nND8DpZo
Just downgrade the jira-Plugin to 2.5.0 -- You received this message because you are subscribed to the Google Groups "Jenkins Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/jenkinsci-users/69d9b650-2764-4447-bf51-516ad5aab1cd%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
