How do I fix the "World Data Corrupted" error in multiplayer?

The ''World Data Corrupted'' error in Valheim multiplayer can be a frustrating issue, but it is often fixable with the right steps. This error typically occurs when the game fails to load or save world data properly, which can happen due to file corruption, server issues, or mismatched game versions. Understanding the game mechanics and how world data is stored is key to resolving this problem.\n\nFirst, ensure that all players in the multiplayer session are using the same version of Valheim. Mismatched versions between the host and other players can cause corruption errors. To check your game version, open Steam, go to your library, right-click Valheim, and select ''Properties.'' Under the ''Updates'' tab, verify that the game is up to date. If updates are available, install them and restart the game.\n\nIf the error persists, the next step is to check the integrity of your game files. Corrupted game files can lead to world data issues. In Steam, right-click Valheim, select ''Properties,'' then navigate to the ''Local Files'' tab and click ''Verify Integrity of Game Files.'' This process will scan and repair any corrupted or missing files. Once completed, restart the game and attempt to load the world again.\n\nAnother common cause of the ''World Data Corrupted'' error is a corrupted world save file. Valheim stores world data in two files: a .fwl file (world metadata) and a .db file (world data). These files are located in your local save folder. To access them, navigate to ''C:\Users\[YourUsername]\AppData\LocalLow\IronGate\Valheim\worlds'' on Windows. Look for files named after your world. If one of these files is corrupted, you may need to restore a backup.\n\nValheim automatically creates backups of your world files. In the same folder, you will find files with the extension .old. These are backup files created by the game. To restore a backup, rename the corrupted file (e.g., ''MyWorld.db'') to something else (e.g., ''MyWorld_corrupted.db''), then rename the corresponding .old file (e.g., ''MyWorld.db.old'') to the original file name (e.g., ''MyWorld.db''). This should restore your world to its previous state.\n\nIf you are hosting a dedicated server, ensure that the server software is up to date and compatible with the client version. Dedicated servers require separate updates, which can be downloaded from SteamCMD or other sources. Additionally, check the server logs for any errors or warnings that might indicate the cause of the corruption.\n\nFor players experiencing this error in a shared world, it is important to communicate with the host. The host should verify their game files and check for corrupted world data. If the host''s world is corrupted, they may need to restore a backup or create a new world. In some cases, starting a new world and transferring important items or structures using console commands or mods can save progress.\n\nTo prevent future corruption, always back up your world files manually. Copy the .fwl and .db files to a separate folder or cloud storage regularly. This ensures that you have a recent backup in case of corruption. Additionally, avoid shutting down the game or server abruptly, as this can increase the risk of file corruption.\n\nIn summary, the ''World Data Corrupted'' error in Valheim multiplayer can often be resolved by ensuring all players have the same game version, verifying game files, restoring backups, and maintaining proper server management. By following these steps and taking preventive measures, you can minimize the risk of encountering this issue and enjoy a smoother multiplayer experience.