From time to time an error occurs as in the screenshot. Screen Shot 2016-06-22 at 11.41.38.png
I assume this is JIRA Cloud? This is something you should raise with Atlassian support at https://support.atlassian.com - the instinct for me is to read the log file and then report it to the add-on vendor, but you don't have access to Cloud logs, so a support call is needed.
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