Hi,
I'm a free trial user, and I need to try your Importers Plugin for Mantis to Jira. So after the installation of JIRA I can acces to the Manage add-ons panel, I can Importers because he is installed with the basic installation. But he is gray tinted and when i click on it to develop this message appear:
"This add-on couldn't be loaded. It has one or more errors that prevent it from being enabled."
I've got JIRA 6.1.1 and my version of Importers is 6.0.27.
Hope you will help me 
