Problem z MundoSK

Przy włączaniu serwera wyskakuje mi następujący błąd:

[11:13:54] [ServerMain/INFO]: [PluginInitializerManager] Initializing plugins...
[11:13:54] [Paper Plugin Remapper Thread - 0/INFO]: [PluginRemapper] Remapping plugin 'plugins/MundoSK.jar'...
[11:13:55] [ServerMain/ERROR]: [PluginRemapper] Encountered exception remapping plugins
java.util.concurrent.CompletionException: java.lang.RuntimeException: Failed to remap plugin jar 'plugins/MundoSK.jar'
        at java.base/java.util.concurrent.CompletableFuture.encodeThrowable(CompletableFuture.java:315) ~[?:?]
        at java.base/java.util.concurrent.CompletableFuture.completeThrowable(CompletableFuture.java:320) ~[?:?]
        at java.base/java.util.concurrent.CompletableFuture$UniApply.tryFire(CompletableFuture.java:649) ~[?:?]
        at java.base/java.util.concurrent.CompletableFuture$Completion.run(CompletableFuture.java:482) ~[?:?]
        at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144) ~[?:?]
        at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642) ~[?:?]
        at java.base/java.lang.Thread.run(Thread.java:1583) ~[?:?]
Caused by: java.lang.RuntimeException: Failed to remap plugin jar 'plugins/MundoSK.jar'
        at io.papermc.paper.pluginremap.PluginRemapper.lambda$remap$7(PluginRemapper.java:358) ~[paper-1.21.4.jar:1.21.4-118-73f7736]
        at java.base/java.util.concurrent.CompletableFuture$UniApply.tryFire(CompletableFuture.java:646) ~[?:?]
        ... 4 more
Caused by: java.lang.IllegalStateException: Duplicate entries detected: com/pie/tlatoani/ProtocolLib/Alias/PacketInfoAlias.class, com/pie/tlatoani/Registration/DocumentationBuilder$Effect.class, com/pie/tlatoani/Registration/DocumentationBuilder$Scope.class, com/pie/tlatoani/Registration/DocumentationElement$Effect.class, com/pie/tlatoani/Registration/DocumentationElement$Expression.class, com/pie/tlatoani/Registration/EnumClassInfo$2.class, com/pie/tlatoani/Skin/Skin.class, com/pie/tlatoani/Tablist/TablistManager.class, com/pie/tlatoani/Util/MundoPropertyExpression$Info.class, com/pie/tlatoani/Util/Reflection$1.class, com/pie/tlatoani/Util/Reflection$ConstructorInvoker.class, com/pie/tlatoani/Util/Reflection$FieldAccessor.class, com/pie/tlatoani/Util/Reflection$MethodInvoker.class, com/pie/tlatoani/WebSocket/WebSocketClientFunctionality$Nebula.class, com/pie/tlatoani/WorldCreator/WorldCreatorMundo$1.class, com/pie/tlatoani/WorldManagement/ExprCurrentWorlds.class, com/pie/tlatoani/ZExperimental/SyntaxPiece/ExpressionConstraints.class, com/pie/tlatoani/ZExperimental/SyntaxPiece/Varying.class, mundosk_libraries/java_websocket/client/WebSocketClient.class, mundosk_libraries/java_websocket/framing/FrameBuilder.class, mundosk_libraries/java_websocket/server/DefaultWebSocketServerFactory.class
        at net.neoforged.art.internal.RenamerImpl.run(RenamerImpl.java:191) ~[paper-1.21.4.jar:?]
        at net.neoforged.art.internal.RenamerImpl.run(RenamerImpl.java:79) ~[paper-1.21.4.jar:?]
        at io.papermc.paper.pluginremap.PluginRemapper.lambda$remap$7(PluginRemapper.java:355) ~[paper-1.21.4.jar:1.21.4-118-73f7736]
        at java.base/java.util.concurrent.CompletableFuture$UniApply.tryFire(CompletableFuture.java:646) ~[?:?]
        ... 4 more

Ktoś może pomóc?