If the version of your JEMH is below 3.3.18, please upgrade Jira to 8.0+ (if Jira is below 8.0) and JEMH to 3.3.18+ or the latest in that series first:
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Failure to follow the above upgrade path may lead to database inconsistencies that prevent the app from functioning, as old upgrade tasks have been removed.
If you have not first upgraded to JEMH 3.x please see the following: