Hello.
1) On screen you only showing your PC spec, error information is lower.
2) When you getting this error, when starting client?
3) On site links only for Live server. Zaken links here: https://l2classic.club/forum/topic/22127-zaken-20-update-is-here/
So my guess is that you downloaded Live ( Savior ) client and updated it with Zaken updater?