"Linkage Error: attempted duplicate class definition" while trying to get ItemComponents

[SilverAndro]

crash-2021-05-26_22.51.54-client.txt

(Source code is in kotlin, shouldn't cause any issues though)

registration:

val MOUNT_ITEM = MountItem(false, FabricItemSettings()
    .maxCount(1)
    .rarity(Rarity.RARE))

val CONTAINER: ComponentKey<MountItemComponent> = ComponentRegistry.getOrCreate(
    Identifier("mole_hill", "container"),
    MountItemComponent::class.java
)

// [...snip...]

override fun registerItemComponentFactories(registry: ItemComponentFactoryRegistry) {
    registry.registerFor(MOUNT_ITEM, CONTAINER) { stack -> MountItemComponent(stack) }
}

Line that causes the issue is a simple Main.CONTAINER.get(stack)

Don't believe the actual component code matters as its never loaded but if needed I can provide it

[diamonddevv]

this error isn't just to do with kotlin, im using java code and im getting the same exception

crash-2023-01-02_14.40.36-server.txt