Could you please tell, how did you install Structure? Did you use
install it from the plugins menu, or manually? Did you restart JIRA
afterwards?
Please try restarting JIRA - if it does not work, there should be some
exceptions in the log during JIRA start; please post them here or send
to
sup...@almworks.com
You don't need to create anything in mysql database - Structure uses a
separate database located in your JIRA home directory.
I'm sorry about the inconvenience caused by this problem. Please let
me know if it gets resolved or if you have more information.
Thanks!
Igor