Cause: The client is missing one or more vital files that are required to load the game. You have not installed the patch or updater properly, you have accidently deleted files, or you are not using the right Chronicle.
Solutions: 1. Make sure none of your folders are empty; ie. systextures, staticmeshes, textures, animations.
███████ 2. If found to be empty, reinstall Lineage 2 after completely removing the client via Control Panel -> Add or Remove Programs.
███████ 3. If step 2 does not work, download a fresh Lineage2 installer