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Copy the complete world folder into a directory your server can access, then run /mv import <worldname> <environment> from the console or as an administrator in game. Use normal for an Overworld, nether for a Nether, and end for an End. The folder must contain the world data and region structure Multiverse-Core expects. If the world is already configured but merely unloaded, use /mv load <worldname> instead of importing it again.
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What importing a world actually does
Multiverse-Core’s import command registers an existing world folder with the server. It does not create a fresh world from a seed, copy terrain into a new folder, or convert one dimension into another. The command description is concise: it “Imports an existing world folder.”
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That distinction determines which command to use. A folder that Multiverse has never registered is an import case. A world that is already present in Multiverse’s configuration but is currently inactive is a load case. Importing an already known world can produce an “already exists” or unloaded-world message; in that situation, loading is the correct operation.
Four inputs decide whether an import succeeds:
- The folder must be the actual world root, not a parent directory that contains the world one level deeper.
- The folder name is the world name Multiverse will use, so preserve the name you intend to type in commands.
- The environment must match the source dimension: Overworld, Nether, End, or an applicable namespaced dimension key.
- If the map depends on a custom generator, that generator must be installed, enabled, and identified with the value its plugin documents.
Prepare the world folder before running the command
Place the complete folder where the server can read it
Move or copy the entire existing world folder into a directory from which the Minecraft server can access its world directories. Do not copy only selected region files or individual subfolders. An incomplete copy can look like a world directory while lacking the data Multiverse needs to validate and load it.
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Keep the folder name you want to use as the Multiverse world name. For example, if the folder is named my_world, the import command uses my_world as its first argument. Renaming a folder after it has been configured can leave the server and the files referring to different names, so settle on the name before importing.
Check that you selected the world root
Open the folder you plan to name in the command and check that it contains the world data and region directories expected by Multiverse-Core. The root should be the directory that directly holds those contents. A frequent mistake is selecting a download or extraction folder that contains another folder with the same map name; Multiverse then examines the wrong level and reports an invalid folder.
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Current Multiverse messages explicitly check for expected world data and region content. If those structures are not detected, the import is rejected as an invalid folder. Recheck the extraction path and copy operation before changing command options.
Identify the source dimension
Decide whether the folder represents a normal Overworld, a Nether, or an End world before importing. The environment argument is not a cosmetic label: Multiverse uses it when configuring how the server treats the world. The official short forms are normal, nether, and end. Some current command usage also documents namespaced dimension keys for dimensions exposed that way by the server or plugins.
If you are uncertain, determine how the source map was created and which dimension its files represent. Do not choose an environment merely because the map is intended for a particular style of play. A wrong value can cause the world to load incorrectly and the command documentation warns that an incorrect environment can create serious problems.
Find out whether a custom generator is required
Most ordinary worlds can be imported with only a world name and environment. A map generated by a terrain, biome, void, or other world-generation plugin is different: the generator plugin must be installed and enabled on the destination server, and the import must include the generator identifier required by that plugin.
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Multiverse cannot reliably infer a generator identifier just from the folder name. Use the identifier supplied by the generator plugin, including any required generator-specific ID. If the plugin documents a value in the form generator:id, preserve that form exactly.
Confirm administrative permission
Run the command from the server console, which does not require an in-game permission check, or use an in-game account that has the multiverse.core.import permission through your server’s permission system. A permission error is separate from a folder or environment error; changing the map files will not fix it.
Import an ordinary world step by step
- Back up the source and destination files. Keep an untouched copy of the existing folder before making configuration changes. This gives you a recovery point if the wrong environment or generator is selected.
- Copy the complete folder into the server-accessible world directory. Preserve the final folder name you want Multiverse to use.
- Inspect the folder root. Confirm that the directory you will name in the command contains the expected world data and region directories, rather than containing another nested map folder.
- Choose the environment. Use
normal,nether, orendaccording to the source dimension. Use a documented namespaced key only when the server or relevant plugin requires one. - Open the server console or enter the command in game with permission. The basic syntax is
/mv import <worldname> <environment>. - Substitute the real folder name and environment. For a folder named
my_worldthat is an Overworld, run/mv import my_world normal. - Read the complete response. A successful import registers the existing folder. If Multiverse reports an invalid folder, an environment or generator problem, a duplicate world, or a permission failure, stop and follow the matching troubleshooting path instead of repeatedly issuing the same command.
- Keep the folder and configuration names aligned. After registration, refer to the world by the same name used for the folder. Do not import it again merely because it is not currently loaded.
Command examples for each dimension
| Source map | Command | When to use it |
|---|---|---|
| Overworld or normal world | /mv import my_world normal |
The existing folder contains a standard Overworld map. |
| Nether | /mv import my_nether nether |
The folder is a Nether world and should use Nether environment rules. |
| End | /mv import my_end end |
The folder is an End world. |
| Custom-generated map | /mv import custom_map normal --generator <generator[:id]> |
The map depends on a generator plugin; replace the placeholder with that plugin’s documented identifier. |
The examples use the folder name as the world name. Replace each name with the actual directory name on your server. The generator form is intentionally a placeholder: the correct value is specific to the generator plugin and cannot be safely guessed from the map files alone.
Choosing the right environment
normal
Use normal for a conventional Overworld map. This is the appropriate choice for most maps made with standard Overworld generation, including adventure maps whose terrain is stored as ordinary Overworld world data.
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Use nether when the source folder is a Nether world. Selecting normal for Nether data does not simply rename the dimension; it gives Multiverse and the server incompatible environment information.
end
Use end for an End map. End terrain and world behavior are distinct from both the Overworld and Nether, so the argument must reflect the source dimension even when the map is being used as a lobby or minigame arena.
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Namespaced dimension keys
Some current command usage documents namespaced dimension keys where applicable. These keys are relevant when a server or dimension plugin exposes an environment outside the three short forms. Use the exact key supported by the Multiverse-Core and server versions you run; do not invent a namespace or substitute a key from a different plugin.
Importing a map that uses a custom generator
A custom generator changes the import from a two-argument command to a command that also identifies the generator. The general form is:
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For example:
/mv import custom_map normal --generator <generator[:id]>
Replace <generator[:id]> with the exact identifier documented by the generator plugin. The plugin must already be installed and enabled on the server. If it is missing, disabled, or identified incorrectly, Multiverse may be unable to reproduce the map’s generator settings or may load the world incorrectly.
The environment and generator are independent inputs. A correct generator does not compensate for a wrong dimension, and a correct dimension does not make an unavailable generator work. Check both before retrying an import.
Import versus load: use the command that matches the world’s state
| Server state | Correct command | Reason |
|---|---|---|
| The folder exists but Multiverse has never registered it. | /mv import <worldname> <environment> |
Import registers an existing world folder. |
| Multiverse already knows the world, but it is unloaded. | /mv load <worldname> |
Load activates a configured world; importing again is unnecessary. |
| The server says the world already exists. | Check whether it is configured and unloaded, then use /mv load <worldname> if appropriate. |
The duplicate message indicates a registration-state issue rather than a missing-folder import. |
This distinction prevents a common loop: copying the same folder repeatedly and rerunning /mv import when the world is already present in Multiverse. First establish whether the problem is registration or loading, then choose the corresponding command.
Troubleshooting failed imports
Invalid-folder or missing-world-data error
When Multiverse reports that the folder is invalid, verify the path and directory depth first. The name in the command must identify the folder that directly contains the expected world data and region directories. Re-extract the map if necessary and check that the copy completed.
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Do not treat the presence of a folder name as proof that the folder is a valid world. A parent directory, an incomplete transfer, or a folder containing only a few region files can all fail validation. The project exposes a --skip-folder-check option, but the available messages do not establish that bypass as a generally safe repair. Use it only if you understand why the normal structure check is inappropriate and have a reliable backup; correcting the folder is the safer first response.
Environment mismatch
If you selected the wrong dimension, stop before doing further imports and identify the source environment. The command reference warns that an incorrect environment can cause serious problems, including a world that is damaged or misloaded. Correct the command to use normal, nether, end, or the exact supported namespaced key, and work from the original backup when you need to undo a bad configuration.
Custom generator failure
Confirm that the generator plugin is installed and enabled, then obtain its exact identifier from that plugin’s documentation. Check punctuation, capitalization, and any required :id suffix. Multiverse does not infer an identifier from the folder name, and replacing a custom generator with a standard environment does not preserve the map’s intended terrain rules.
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Run the import from the server console or grant the importing administrator the multiverse.core.import permission in the server’s permission system. A permission fix should be made before changing world files; otherwise a correctly prepared folder can appear to be an import failure simply because the command was rejected.
World already exists or is unloaded
If the server indicates that Multiverse already knows the world but it is unloaded, use /mv load <worldname>. Import is for registering a folder that Multiverse does not know about. Repeating import in this state does not make an unloaded configured world active.
Namespaced environment is rejected
Check the command usage available in the Multiverse-Core build and the dimension plugin that supplied the key. Namespaced keys are version- and plugin-dependent. If the map is an ordinary Overworld, Nether, or End world, use the documented short form instead of a guessed namespace.
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A decision checklist before you press Enter
- Dimension: Have you identified the source as Overworld, Nether, End, or a specific namespaced dimension?
- Folder: Does the named directory directly contain the world data and region structure Multiverse expects?
- Name: Is the folder name exactly the world name you intend to use in Multiverse commands?
- Generator: Does the map require a custom generator, and is that plugin enabled with its documented identifier?
- Registration: Is this a new folder for Multiverse, or is the world already configured and merely unloaded?
- Access: Are you using the console or an account with
multiverse.core.import? - Recovery: Do you have an untouched copy of the world before testing a questionable environment or generator combination?
Comparing common import cases
| Case | Environment input | Custom generator dependency | Folder check | Multiverse state | Action |
|---|---|---|---|---|---|
| Standard Overworld folder not known to Multiverse | normal |
None stated | Must contain expected world data and region directories | Not registered | Run /mv import <worldname> normal. |
| Existing Nether map | nether |
None stated unless the map was custom-generated | Must pass the same world-root validation | Not registered | Run /mv import <worldname> nether. |
| Existing End map | end |
None stated unless the map was custom-generated | Must pass the same world-root validation | Not registered | Run /mv import <worldname> end. |
| Custom-generated map | Matching short form or supported namespaced key | Required when the source depends on a generator plugin | Must pass validation before generator settings are useful | Not registered | Import with --generator <generator[:id]> after installing and enabling the generator. |
| Configured but inactive world | Already established in configuration | Already established in configuration | Folder is already known | Registered but unloaded | Run /mv load <worldname>, not import. |
Practical examples
Importing an Overworld adventure map
Suppose the server can access a complete folder named castle_adventure, and the map was built as an ordinary Overworld. After checking the folder root, run:
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/mv import castle_adventure normal
The folder name becomes the Multiverse world name. If the command reports that the world is already known but unloaded, stop using import and run /mv load castle_adventure.
Importing a Nether build
For a complete Nether folder named nether_hub, use:
/mv import nether_hub nether
The nether argument tells Multiverse which environment the existing files represent. Do not substitute normal simply because players will enter the map through an Overworld portal.
Importing an End arena
For an End folder named end_arena, use:
/mv import end_arena end
As with every import, the command assumes that end_arena is the actual world root and that its expected data and region directories are present.
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For a custom map named sky_void, use the generator plugin’s documented identifier in the generator option:
/mv import sky_void normal --generator <generator[:id]>
The angle-bracket text is a placeholder, not a literal value. Replace it before execution, and make sure the matching generator plugin is enabled.
What a successful import does not guarantee
A command that is accepted confirms that Multiverse registered the folder with the supplied settings; it does not make an incorrect environment correct or supply a missing generator plugin. The quality of the result still depends on matching the source dimension, preserving the complete world structure, and providing compatible generator information.
For that reason, treat the command response and the map’s registration state as separate checks. A folder can be valid but already registered, a registered world can be unloaded, and a syntactically correct command can still carry an incompatible environment or generator. Resolve the specific state reported by the server rather than changing several inputs at once.
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