The error message "Active anticheat Error: Cannot get special l2 functions(10)!" indicates that there is an issue with the anticheat system of the game. This error message is related to Lineage 2 (l2) game and it appears when the anticheat system is unable to load some special functions. This can be caused by a variety of reasons, such as outdated game client, corrupted game files, or compatibility issues with the operating system or the hardware.

To resolve this issue, you can try updating the game client to the latest version, verifying the game files for any corruption or missing files, and ensuring that your operating system and hardware meet the game's system requirements. Additionally, you can try disabling any antivirus or firewall software temporarily to see if that resolves the issue. If the issue persists, you may need to contact the game's support team or community forums for further assistance.