does not support 1.21

[hkkongou]

Describe the bug
error on enable

To Reproduce
Steps to reproduce the behavior:

1. install plugin

Expected behavior
plugin can be loaded

Screenshots

[PluginRemapper] Encountered exception remapping plugins
java.util.concurrent.CompletionException: java.lang.RuntimeException: Failed to remap plugin jar 'plugins\RealDualWield_1.1.37.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$Worker.run(ThreadPoolExecutor.java:642) ~[?:?]
        at java.base/java.lang.Thread.run(Thread.java:1583) ~[?:?]
Caused by: java.lang.RuntimeException: Failed to remap plugin jar 'plugins\RealDualWield_1.1.37.jar'
        at io.papermc.paper.pluginremap.PluginRemapper.lambda$remap$7(PluginRemapper.java:358) ~[paper-1.21.jar:1.21-124-df3b654]
        at java.base/java.util.concurrent.CompletableFuture$UniApply.tryFire(CompletableFuture.java:646) ~[?:?]
        ... 4 more
Caused by: java.lang.RuntimeException: Failed to execute task com/evill4mer/RealDualWield/a/b
        at net.neoforged.art.internal.AsyncHelper.invokeAll(AsyncHelper.java:56) ~[AutoRenamingTool-2.0.3.jar:?]
        at net.neoforged.art.internal.AsyncHelper.consumeAll(AsyncHelper.java:36) ~[AutoRenamingTool-2.0.3.jar:?]
        at net.neoforged.art.internal.RenamerImpl.run(RenamerImpl.java:177) ~[paper-1.21.jar:?]
        at net.neoforged.art.internal.RenamerImpl.run(RenamerImpl.java:95) ~[paper-1.21.jar:?]
        at io.papermc.paper.pluginremap.PluginRemapper.lambda$remap$7(PluginRemapper.java:355) ~[paper-1.21.jar:1.21-124-df3b654]
        at java.base/java.util.concurrent.CompletableFuture$UniApply.tryFire(CompletableFuture.java:646) ~[?:?]
        ... 4 more
Caused by: java.util.concurrent.ExecutionException: java.lang.IllegalStateException: Duplicate key a (attempted merging values default com/evill4mer/RealDualWield/a/b/a I and final synthetic com/evill4mer/RealDualWield/a/b/a Lcom/evill4mer/RealDualWield/a/a;)
        at java.base/java.util.concurrent.FutureTask.report(FutureTask.java:122) ~[?:?]
        at java.base/java.util.concurrent.FutureTask.get(FutureTask.java:191) ~[?:?]
        at net.neoforged.art.internal.AsyncHelper.invokeAll(AsyncHelper.java:52) ~[AutoRenamingTool-2.0.3.jar:?]
        at net.neoforged.art.internal.AsyncHelper.consumeAll(AsyncHelper.java:36) ~[AutoRenamingTool-2.0.3.jar:?]
        at net.neoforged.art.internal.RenamerImpl.run(RenamerImpl.java:177) ~[paper-1.21.jar:?]
        at net.neoforged.art.internal.RenamerImpl.run(RenamerImpl.java:95) ~[paper-1.21.jar:?]
        at io.papermc.paper.pluginremap.PluginRemapper.lambda$remap$7(PluginRemapper.java:355) ~[paper-1.21.jar:1.21-124-df3b654]
        at java.base/java.util.concurrent.CompletableFuture$UniApply.tryFire(CompletableFuture.java:646) ~[?:?]
        ... 4 more
Caused by: java.lang.IllegalStateException: Duplicate key a (attempted merging values default com/evill4mer/RealDualWield/a/b/a I and final synthetic com/evill4mer/RealDualWield/a/b/a Lcom/evill4mer/RealDualWield/a/a;)
        at java.base/java.util.stream.Collectors.duplicateKeyException(Collectors.java:135) ~[?:?]
        at java.base/java.util.stream.Collectors.lambda$uniqKeysMapAccumulator$1(Collectors.java:182) ~[?:?]
        at java.base/java.util.stream.ReduceOps$3ReducingSink.accept(ReduceOps.java:169) ~[?:?]
        at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:197) ~[?:?]
        at java.base/java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1708) ~[?:?]
        at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509) ~[?:?]
        at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499) ~[?:?]
        at java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:921) ~[?:?]
        at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) ~[?:?]
        at java.base/java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:682) ~[?:?]
        at net.neoforged.art.internal.ClassProviderImpl$ClassInfo.<init>(ClassProviderImpl.java:122) ~[AutoRenamingTool-2.0.3.jar:?]
        at net.neoforged.art.internal.ClassProviderBuilderImpl.lambda$addClass$1(ClassProviderBuilderImpl.java:64) ~[AutoRenamingTool-2.0.3.jar:?]
        at java.base/java.util.concurrent.ConcurrentHashMap.computeIfAbsent(ConcurrentHashMap.java:1708) ~[?:?]
        at net.neoforged.art.internal.ClassProviderBuilderImpl.addClass(ClassProviderBuilderImpl.java:64) ~[AutoRenamingTool-2.0.3.jar:?]
        at net.neoforged.art.internal.RenamerImpl.lambda$run$2(RenamerImpl.java:178) ~[paper-1.21.jar:?]
        at net.neoforged.art.internal.AsyncHelper.lambda$null$0(AsyncHelper.java:33) ~[AutoRenamingTool-2.0.3.jar:?]
        at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:317) ~[?:?]
        ... 3 more

Info (please complete the following information):

• Server version: 1.21
• Client version: 1.21
• Plugin version: rdw 1.1.37

Additional context
no