We're having the issue that users cannot close the tickets because they get this error. It seems when they enter a comment and then click on the close button the error comes up. If they refresh the page before they click the close button it works. Seems something odd with the session handling.
That is a reason description coming from a validator in the workflow, something your admins have added. The language in the red error message is not the way the Atlassian phrases their warnings, so I suspect it is a custom validator.
Your admins should really put in a more informative error message, one that tells you what you were doing wrong.
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