(Edited my message a 3rd time) All solved. Basically, the plugin NEEDS your Book (core plugin) which I didnt know was a thing. Otherwise, you get an "ConvertEscapeVariablesOnly of Undefined" error. With the second plugin, it all works as intended. So thank you, Hakuen. 

Hi there!

Glad you managed to find the problem. Sorry for the late answer. 

Some plugins need others. Just make sure to check the plugin manager warning about that, on the bottom of the plugin manager window.