The 1.21 To 1.8.9 Failed to convert

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Error Log

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  Running Converters
    Running NameConverter
Failed to convert!
[com.agentdid127.resourcepack.library.utilities.Util.propagate(Util.java:102), com.agentdid127.resourcepack.backwards.BackwardsPackConverter.runPack(BackwardsPackConverter.java:104), com.agentdid127.resourcepack.backwards.BackwardsPackConverter.lambda$runDir$0(BackwardsPackConverter.java:113), java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:184), java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:179), java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:197), java.base/java.util.Iterator.forEachRemaining(Iterator.java:133), java.base/java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1939), java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509), java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499), java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:151), java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:174), java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234), java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:596), com.agentdid127.resourcepack.backwards.BackwardsPackConverter.runDir(BackwardsPackConverter.java:112), com.agentdid127.resourcepack.GUI.lambda$null$0(GUI.java:53), java.base/java.lang.Thread.run(Thread.java:1583)]

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they are same

Running Converters
Running NameConverter
Failed to convert!
[com.agentdid127.resourcepack.library.utilities.Util.propagate(Util.java:102), com.agentdid127.resourcepack.backwards.BackwardsPackConverter.runPack(BackwardsPackConverter.java:104), com.agentdid127.resourcepack.backwards.BackwardsPackConverter.lambda$runDir$0(BackwardsPackConverter.java:113), java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:184), java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:179), java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:197), java.base/java.util.Iterator.forEachRemaining(Iterator.java:133), java.base/java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1939), java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509), java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499), java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:151), java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:174), java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234), java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:596), com.agentdid127.resourcepack.backwards.BackwardsPackConverter.runDir(BackwardsPackConverter.java:112), com.agentdid127.resourcepack.GUI.lambda$null$0(GUI.java:53), java.base/java.lang.Thread.run(Thread.java:1583)]

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This is Error Log
Version: 2.2.4