We can't create this issue for you right now, it could be due to unsupported content you've entered into one or more of the issue fields. If this situation persists, contact your administrator as they'll be able to access more specific information in the log file.
This error is usually caused by a post function in the Create Issue transition.
To troubleshoot and debug:
Either a certain add-on/plugin is disabled that was previously being used, or some post functions are not positioned in proper order and has problems on runtime, thus the issue can't be created.
If all post functions look ok, then you probably contact support at support.atlassian.com
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