This Plugin is Awesome! I would rate this with 10 star if It was possible because you had the time for making a new release for latest version without asking any money. Great Job!
I use the plugin for my server and placeholderAPI works perfectly did you have the correct version of PlaceholderAPI? did you install the libs from the ecloud?
https://github.com/PlaceholderAPI/PlaceholderAPI/wiki/Placeholders there's a list :)
I hope I helped you.