How do I troubleshoot the "World Not Found" error in multiplayer?

The ''World Not Found'' error in Valheim multiplayer can be frustrating, but it is often caused by issues with world files, server settings, or connectivity. This error typically occurs when a player tries to join a multiplayer game, but the server cannot locate or load the world file. To troubleshoot this issue, you need to understand how Valheim handles world data and multiplayer connections.\n\nFirst, ensure that the host player has properly set up the world for multiplayer. When creating or loading a world, the host must select the ''Start Server'' option and set a password if desired. If the host is using a dedicated server, they must ensure the server is running and the world file is correctly configured. For example, the world file must be placed in the correct directory (usually in the ''worlds'' folder within the Valheim save directory) and named appropriately.\n\nNext, check the integrity of the world file. Corrupted or missing world files are a common cause of the ''World Not Found'' error. The host should verify that the world file exists and is not corrupted. If the file is missing, the host may need to restore it from a backup or create a new world. To back up your world files, navigate to the Valheim save directory (typically found in ''C:\Users\[YourUsername]\AppData\LocalLow\IronGate\Valheim\worlds'' on Windows) and copy the .db and .fwl files to a safe location.\n\nIf the world file is intact, the issue may be related to server settings or connectivity. For dedicated servers, ensure that the server configuration file (usually named ''start_headless_server.bat'' or similar) is correctly set up with the right world name and port settings. For example, the command line should include the world name and port number, such as ''-world [YourWorldName] -port 2456''. Additionally, ensure that the server''s firewall or router is configured to allow traffic on the specified port.\n\nAnother common issue is mismatched game versions between the host and the joining players. Valheim frequently receives updates, and if the host is running a different version of the game, the ''World Not Found'' error may occur. Ensure that all players have updated their game to the latest version through their respective platforms (Steam, Xbox, etc.).\n\nIf the issue persists, try restarting the game or server. Sometimes, temporary glitches can cause the error, and a simple restart can resolve it. For dedicated servers, ensure that the server software is up to date and compatible with the current version of Valheim. Additionally, check for any mods or custom content that might conflict with the game''s multiplayer functionality. Disable mods temporarily to see if they are causing the issue.\n\nFinally, if none of the above solutions work, consider creating a new world and testing multiplayer functionality with it. This can help determine if the issue is specific to the original world file or a broader problem with the game or server setup. If the new world works, you may need to troubleshoot the original world file further or start fresh.\n\nIn summary, the ''World Not Found'' error in Valheim multiplayer can be resolved by verifying world file integrity, checking server settings, ensuring game version compatibility, and testing with a new world. Always back up your world files to avoid data loss and keep your game and server software up to date for the best multiplayer experience.