I'm getting a similar error! Everytime I open the skills the game just closes. I'm using 2018-06-20 client and I already tried adding the skillinfoz.rar on the data folder. I also tried renaming the "skilltreeview20180620.lub" file into "skilltreeview.lub" but it didn't work.
Could you explain how that worked out for you?? I'm really lost !!