It is exactly what the error message says it is.
You have too many users and have exceeded your licence. Either get a licence for more of them, or reduce your active user count. Your administrators need to do that, I'm afraid we're a community of end-users, not your admins.
Please deactivate or delete the inactive users soon. This problem will be faced by all the users now. refer this,
https://answers.atlassian.com/questions/202113
https://confluence.atlassian.com/jirakb/what-happens-when-i-reach-my-licenses-user-limit-in-jira-374997459.html
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