Js Help desk

I’m using the free version of the js help desk plugin, so far so good, but there is a problem with the login form, when I try to login with a fake account or with a non-existent user the following sms appears [jsvehiclemanager_control_panel], it was supposed an “nonexistent user or wrong password” message appears.

Can someone help me?

The page I need help with: [log in to see the link]