The problem was that by default the plugin had trees setup for 8 actors which was more than I have in the game. I deleted the last 3 and now it works fine.
Thanks for the feedback, I hadn't yet received notifications from users who used more than that number of trees. I believe that if you create trees for the other characters as well, the error should disappear.
Thank you for all the support, if you need anything, just let me know!
