Multiworld Delete Command Fails: Troubleshooting & Solutions

Nov 5, 2025 by Admin 61 views

Hey guys! So, you're having trouble deleting worlds in your Minecraft server using the Multiworld mod, huh? Don't sweat it, we'll dive right into the issue and try to get things sorted out. Based on the error logs you provided, it seems like there's a problem with how the Multiworld mod interacts with the Fantasy mod (likely a dependency or a core component for world management).

The Problem: Understanding the Error

Let's break down that nasty NullPointerException (the java.lang.NullPointerException: Cannot invoke "xyz.nucleoid.fantasy.RuntimeWorldConfig.createDimensionOptions...") you're seeing in the server logs. In simple terms, this error means that the game is trying to use something that doesn't exist – in this case, a configuration object (config) that's supposed to hold the settings for your world. The game expects this config object to be there, but it's null, meaning it's missing, leading to the crash. This is a pretty common error in software development, and it usually means something didn't initialize correctly or was not found when the mod tried to access it.

The error points specifically to the xyz.nucleoid.fantasy.RuntimeWorldManager.add function, which is within the Fantasy mod. This function is likely responsible for adding a world to the server's running configuration. When Multiworld tries to delete a world, it triggers a process that interacts with Fantasy to remove the world from the server. The issue lies within this process, specifically the failure to find the world's configuration, preventing Fantasy from properly deleting the world. Since Fantasy is not finding the configuration information, the world cannot be deleted successfully, leading to the error and the deletion process failing.

Now, the crucial point here is that this is happening during the deletion process. This means the problem isn't necessarily with the world itself, but with how Multiworld is handling the removal of the world's data and how it interacts with the Fantasy mod to accomplish this.

Analyzing the Stack Trace

The stack trace (those lines in the error log) provides a roadmap of the problem. It shows the exact sequence of events that led to the error. Let's look at a simplified version of it to help understand where the issue is happening:

Deletion Command: You ran the /mw delete memoriamemories1 command. This triggered the delete process.
Multiworld's Delete Function: The me.isaiah.multiworld.command.DeleteCommand.run function within the Multiworld mod initiated the world deletion.
Fantasy's Interaction: Multiworld likely calls upon Fantasy to perform the actual deletion of world data and configuration. This is where xyz.nucleoid.fantasy.RuntimeWorldManager.add is called.
The Error: Inside Fantasy, the code tries to access the world configuration, but it's missing (the NullPointerException occurs).
Failure: The deletion fails, leaving the world undeleted and the server with an error.

The stack trace confirms that the issue is within Fantasy's handling of the world configuration during the deletion process initiated by the Multiworld mod.

Troubleshooting Steps & Potential Solutions

Okay, so what can we do to try and fix this? Here are some troubleshooting steps and potential solutions to help resolve the NullPointerException and get your world deletions working again.

1. Mod Compatibility and Version Checks

Verify Versions: First and foremost, check the versions of all your mods, especially Multiworld and Fantasy. Ensure they are compatible with each other and with your Minecraft server version (1.21.10 Fabric in your case). Compatibility issues are a leading cause of these types of errors. Make sure you're using the latest, stable versions. Check the mod's official pages (e.g., CurseForge, Modrinth) for compatibility information.
Dependency Conflicts: Check if any other mods are conflicting with Multiworld or Fantasy. Some mods might not be fully compatible and could cause issues during world deletion. Try temporarily removing other mods to see if the issue resolves itself. If it does, you've identified a conflict, and you'll need to either find compatible versions or consider alternate mods. Carefully read the documentation for each mod installed to check for known conflicts.

2. Configuration File Issues

Multiworld Configuration: It's worth checking the Multiworld configuration files. There might be some settings in the configuration that affect how worlds are deleted. Ensure that all the relevant settings are correctly set and that there are no conflicting options. Sometimes, a setting might cause the game to search for a non-existent configuration or fail to properly remove files.
Fantasy Configuration: Also, check the Fantasy mod's configuration files (if they exist). While less likely, a corrupted or misconfigured Fantasy could be the root cause. Try resetting the Fantasy configuration to its defaults to see if that resolves the error. Be careful when modifying configurations, and always back up your files.

3. Manual File Deletion (Use with Caution!)

Back Up First: Important: Before attempting this, back up your entire server folder! If you mess this up, you could corrupt your server!
Manual Deletion Steps: If the above steps fail, you can try deleting the world folder manually. Here's how, but be super careful:
1. Stop the Server: Completely shut down your Minecraft server.
2. Locate the World Folder: Find the server's main directory. Inside, you should see folders for your worlds. Look for the folder named memoriamemories1. This is where the world's files are stored.
3. Delete the Folder: Delete the entire memoriamemories1 folder. Again, be absolutely sure you have a backup.
4. Restart the Server: Start your server back up. Multiworld should now consider this world as deleted. If this works, then there may be a problem with Multiworld's config, since it might not be properly removing the world from its own configuration. Check this.
Why this is Risky: This approach doesn't address the root cause of the error. It's essentially a workaround. Also, be aware that there could be lingering references to the world in the server's configuration files. This method removes the world's physical files but may not remove all related data from the server's database. If you don't take the necessary precautions, it could lead to potential errors or conflicts.

4. Update or Reinstall Mods

Update Multiworld and Fantasy: Try updating both Multiworld and Fantasy to the latest versions. Bugs are frequently fixed in newer versions, and this might resolve the NullPointerException. Make sure to download the compatible versions for your Minecraft server version (1.21.10 Fabric).
Reinstall: If updating doesn't work, consider reinstalling both mods. This ensures that all the mod files are properly placed and that there are no corrupted files. Make sure you remove the existing mod files completely before reinstalling them. Try this as a last resort.

5. Check for Corrupted World Data

World Corruption: It's rare, but the world data itself could be corrupted, causing the deletion process to fail. Use the backup of your world and replace the current world folder with the backup folder to see if this fixes the problem.

6. Contact the Mod Developers

Report the Bug: If you've tried everything above, it's time to report the bug to the Multiworld and/or Fantasy mod developers. Include the full error log, the versions of your mods, and the steps you've taken to reproduce the error. They can use this information to investigate the problem and potentially release a fix. Look for the mod's official channels (GitHub, Discord, forums, etc.) to report the bug.

7. Alternative: Using a Server Management Tool

Server Management: Sometimes, these types of issues are resolved by using a dedicated server management tool, which has built-in features for world management. This might make the deletion easier. These tools offer more robust methods for managing your worlds, often resolving issues like the NullPointerException you're seeing.

Request for World Import Functionality

Yes, I agree, the world import functionality is highly valuable. Having the ability to import existing worlds into your server is important. While this feature may not exist in your current setup, it’s a great suggestion and worth exploring. Here's what you can do about it:

Check Mod Documentation: Carefully review the Multiworld and Fantasy mod documentation. Search for any information about importing worlds. The feature might already exist in a slightly different form than you expect.
Explore Alternative Mods: If the feature isn't supported, look for other mods. There might be mods specifically designed for world import that work well with Multiworld or as a replacement for it.
Submit a Feature Request: If a feature does not exist, submit the feature request to the mod developers. They may consider it for a future update.

Conclusion: Getting Back to Gaming

Dealing with errors can be frustrating, especially when it prevents you from doing what you enjoy – playing Minecraft with your friends. By going through these troubleshooting steps, you should be able to identify the root cause of the world deletion problem and find a solution. Keep in mind that software can be tricky, so be patient, methodical, and don't be afraid to reach out to the mod developers for help. Good luck, and happy crafting!