Hi there!
This is not an issue, was a bad configuration from you. This plugin let you customize the Message Window position for each position type the default message window has. As so, you need to go into the plugin parameter and setup the Top, Center, and Bottom settings. If you leave it blank, the plugin won't work at all, because a silent error will show up on the console:
So, if you open plugin and don't etup their parameters, they will probably have an error, this will be an expected behavior.