Error dialog popup- jira script listener

[Dan27]

Hi,

I want to create a pop-up error that displayed when the user choose a wrong version.

I created the code, it worked okay, but I want to make an error that didn't disapear (you need to click "ok" or "close" to contivue working and close the dialog)

This is my code for the current dialog:

UserMessageUtil.error("Bla Bla Bla");

Daniel