Skills don't work

Newbie Spellweaver
Joined
Dec 22, 2020
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Hello everyone.

I want to ask your help with this issue, I have started a 1.5.5 server, and I have asked a friend for help with some tests. And I have a glitches with the client game.

He already had a client of the same version downloaded and I have only downloaded the Element / data files, but I get following.

1. When casting skills, I get the message "critical error" and they don't activate. :

In my client, works fine, what file should I update in my friend's client??