Error 500 is pretty generic, so if you could paste a piece of your stack trace could help us to help you .
Well, I've found this critical bug on Confluence https://jira.atlassian.com/browse/CONF-36771 related to JIRA issues causing code 500 and this another KB https://confluence.atlassian.com/display/JIRAKB/Create+issue+fail+with+500+page+exception+in+the+log.
Can you let us know if this work? If not, please add some logs here.
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