NoClassDefFoundError for net/minecraft/world/entity/player/EntityHuman

[UnLegitCode]

Hello! I'm using Purpur 1.21.1 and getting this error:
[15:08:24] [Server thread/WARN]: java.lang.ExceptionInInitializerError: null
[15:08:24] [Server thread/WARN]: at pulsar.jar//xyz.xenondevs.invui.item.builder.AbstractItemBuilder.get(AbstractItemBuilder.java:131)
[15:08:24] [Server thread/WARN]: at pulsar.jar//xyz.xenondevs.invui.item.ItemProvider.get(ItemProvider.java:31)
[15:08:24] [Server thread/WARN]: at pulsar.jar//lol.anka.pulsar.configuration.ModuleConfiguration.(ModuleConfiguration.java:80)
[15:08:24] [Server thread/WARN]: at pulsar.jar//lol.anka.pulsar.configuration.ConfigurationLoader.loadConfiguration(ConfigurationLoader.java:13)
[15:08:24] [Server thread/WARN]: at pulsar.jar//lol.anka.pulsar.module.ModuleSystem.lambda$initModules$0(ModuleSystem.java:46)
[15:08:24] [Server thread/WARN]: at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:184)
[15:08:24] [Server thread/WARN]: at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:215)
[15:08:24] [Server thread/WARN]: at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:184)
[15:08:24] [Server thread/WARN]: at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:215)
[15:08:24] [Server thread/WARN]: at java.base/java.util.Spliterators$ArraySpliterator.forEachRemaining(Spliterators.java:1024)
[15:08:24] [Server thread/WARN]: at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:570)
[15:08:24] [Server thread/WARN]: at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:560)
[15:08:24] [Server thread/WARN]: at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:151)
[15:08:24] [Server thread/WARN]: at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:174)
[15:08:24] [Server thread/WARN]: at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:265)
[15:08:24] [Server thread/WARN]: at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:636)
[15:08:24] [Server thread/WARN]: at java.base/java.util.stream.ReferencePipeline$7$1FlatMap.accept(ReferencePipeline.java:294)
[15:08:24] [Server thread/WARN]: at java.base/java.util.stream.Streams$StreamBuilderImpl.forEachRemaining(Streams.java:411)
[15:08:24] [Server thread/WARN]: at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:570)
[15:08:24] [Server thread/WARN]: at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:560)
[15:08:24] [Server thread/WARN]: at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:151)
[15:08:24] [Server thread/WARN]: at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:174)
[15:08:24] [Server thread/WARN]: at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:265)
[15:08:24] [Server thread/WARN]: at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:636)
[15:08:24] [Server thread/WARN]: at pulsar.jar//lol.anka.pulsar.module.ModuleSystem.initModules(ModuleSystem.java:35)
[15:08:24] [Server thread/WARN]: at pulsar.jar//lol.anka.pulsar.PulsarPlugin.onLoad(PulsarPlugin.java:79)
[15:08:24] [Server thread/WARN]: at io.papermc.paper.plugin.storage.ServerPluginProviderStorage.processProvided(ServerPluginProviderStorage.java:59)
[15:08:24] [Server thread/WARN]: at io.papermc.paper.plugin.storage.ServerPluginProviderStorage.processProvided(ServerPluginProviderStorage.java:18)
[15:08:24] [Server thread/WARN]: at io.papermc.paper.plugin.storage.SimpleProviderStorage.enter(SimpleProviderStorage.java:39)
[15:08:24] [Server thread/WARN]: at io.papermc.paper.plugin.entrypoint.LaunchEntryPointHandler.enter(LaunchEntryPointHandler.java:40)
[15:08:24] [Server thread/WARN]: at org.bukkit.craftbukkit.CraftServer.loadPlugins(CraftServer.java:561)
[15:08:24] [Server thread/WARN]: at net.minecraft.server.dedicated.DedicatedServer.initServer(DedicatedServer.java:329)
[15:08:24] [Server thread/WARN]: at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1230)
[15:08:24] [Server thread/WARN]: at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:333)
[15:08:24] [Server thread/WARN]: at java.base/java.lang.Thread.run(Thread.java:1575)
[15:08:24] [Server thread/WARN]: Caused by: java.lang.RuntimeException: java.lang.NoClassDefFoundError: net/minecraft/world/entity/player/EntityHuman
[15:08:24] [Server thread/WARN]: at pulsar.jar//xyz.xenondevs.inventoryaccess.util.ReflectionUtils.getImplClass(ReflectionUtils.java:18)
[15:08:24] [Server thread/WARN]: at pulsar.jar//xyz.xenondevs.inventoryaccess.InventoryAccess.(InventoryAccess.java:21)
[15:08:24] [Server thread/WARN]: ... 35 common frames omitted
[15:08:24] [Server thread/WARN]: Caused by: java.lang.NoClassDefFoundError: net/minecraft/world/entity/player/EntityHuman
[15:08:24] [Server thread/WARN]: at java.base/java.lang.Class.forName0(Native Method)
[15:08:24] [Server thread/WARN]: at java.base/java.lang.Class.forName(Class.java:578)
[15:08:24] [Server thread/WARN]: at java.base/java.lang.Class.forName(Class.java:557)
[15:08:24] [Server thread/WARN]: at io.papermc.reflectionrewriter.runtime.AbstractDefaultRulesReflectionProxy.forName(AbstractDefaultRulesReflectionProxy.java:68)
[15:08:24] [Server thread/WARN]: at io.papermc.paper.pluginremap.reflect.PaperReflectionHolder.forName(Unknown Source)
[15:08:24] [Server thread/WARN]: at pulsar.jar//xyz.xenondevs.inventoryaccess.util.ReflectionUtils.getImplClass(ReflectionUtils.java:16)
[15:08:24] [Server thread/WARN]: ... 36 common frames omitted
[15:08:24] [Server thread/WARN]: Caused by: java.lang.ClassNotFoundException: net.minecraft.world.entity.player.EntityHuman
[15:08:24] [Server thread/WARN]: at io.papermc.paper.plugin.entrypoint.classloader.PaperPluginClassLoader.loadClass(PaperPluginClassLoader.java:146)
[15:08:24] [Server thread/WARN]: at io.papermc.paper.plugin.entrypoint.classloader.PaperPluginClassLoader.loadClass(PaperPluginClassLoader.java:107)
[15:08:24] [Server thread/WARN]: at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:528)