Hey guys, I'm having the same problem Hnomkeng had, but with the Rogue class. As soon as I changed class, that error message appeared, and the skill tree was all messed up.
I tried to change the skillinfoz folder by the one Bruno Nogueira uploaded, but the error persisted.
I'm running an offline server that I found in this link:
My client version is 2018-05-30. I didn't update anything, didn't change anything on the server (except the rates).
Does anyone know how to solve this problem? Do I have to keep my client up-to-date?
Edit:
Solved my problem by deleting the file "renewal_asheraf.grf"