This probably needs to go to Riada as a bug report.
But, the error message there is close to useless, it says nothing more than "it went wrong". You need to look at the application log (usually <jira home>/logs/atlassian-jira.log ), describe what you did that lead to the error appearing, and tell us if you can replicate it.
If we can't help you after we get that, Riada will need the same information.
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