Bukkit

i can't use anvil_gui because it doesn't work, and i'd like to know how can i solve that problem?

CONSOLE LOG:
[19:45:46 ERROR]: Could not pass event PlayerCommandPreprocessEvent to MyCommand v5.7.2
java.lang.ExceptionInInitializerError: null
at it.emmerrei.mycommand.utilities.anvilgui.AnvilGUI$Builder.open(AnvilGUI.java:489) ~[MyCommand.jar:?]
at it.emmerrei.mycommand.utilities.anvilgui.CreateAndOpen.CreateGUI(CreateAndOpen.java:201) ~[MyCommand.jar:?]
at it.emmerrei.mycommand.execute.DispatchCommands.ExecuteMyCommandCommands(DispatchCommands.java:476) ~[MyCommand.jar:?]
at it.emmerrei.mycommand.listener.PreprocessEvent.onPlayerCommandPreprocess(PreprocessEvent.java:283) ~[MyCommand.jar:?]
at com.destroystokyo.paper.event.executor.asm.generated.GeneratedEventExecutor1361.execute(Unknown Source) ~[?:?]
at org.bukkit.plugin.EventExecutor.lambda$create$1(EventExecutor.java:75) ~[purpur-api-1.18.2-R0.1-SNAPSHOT.jar:?]
at co.aikar.timings.TimedEventExecutor.execute(TimedEventExecutor.java:76) ~[purpur-api-1.18.2-R0.1-SNAPSHOT.jar:git-Purpur-1612]
at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:70) ~[purpur-api-1.18.2-R0.1-SNAPSHOT.jar:?]
at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:665) ~[purpur-api-1.18.2-R0.1-SNAPSHOT.jar:?]
at net.minecraft.server.network.ServerGamePacketListenerImpl.handleCommand(ServerGamePacketListenerImpl.java:2381) ~[?:?]
at net.minecraft.server.network.ServerGamePacketListenerImpl.handleChat(ServerGamePacketListenerImpl.java:2200) ~[?:?]
at net.minecraft.server.network.ServerGamePacketListenerImpl.handleChat(ServerGamePacketListenerImpl.java:2181) ~[?:?]
at net.minecraft.network.protocol.game.ServerboundChatPacket.handle(ServerboundChatPacket.java:46) ~[?:?]
at net.minecraft.network.protocol.game.ServerboundChatPacket.a(ServerboundChatPacket.java:6) ~[?:?]
at net.minecraft.network.protocol.PacketUtils.lambda$ensureRunningOnSameThread$1(PacketUtils.java:51) ~[?:?]
at net.minecraft.server.TickTask.run(TickTask.java:18) ~[purpur-1.18.2.jar:git-Purpur-1612]
at net.minecraft.util.thread.BlockableEventLoop.doRunTask(BlockableEventLoop.java:153) ~[?:?]
at net.minecraft.util.thread.ReentrantBlockableEventLoop.doRunTask(ReentrantBlockableEventLoop.java:23) ~[?:?]
at net.minecraft.server.MinecraftServer.doRunTask(MinecraftServer.java:1426) ~[purpur-1.18.2.jar:git-Purpur-1612]
at net.minecraft.server.MinecraftServer.d(MinecraftServer.java:188) ~[purpur-1.18.2.jar:git-Purpur-1612]
at net.minecraft.util.thread.BlockableEventLoop.pollTask(BlockableEventLoop.java:126) ~[?:?]
at net.minecraft.server.MinecraftServer.pollTaskInternal(MinecraftServer.java:1403) ~[purpur-1.18.2.jar:git-Purpur-1612]
at net.minecraft.server.MinecraftServer.pollTask(MinecraftServer.java:1396) ~[purpur-1.18.2.jar:git-Purpur-1612]
at net.minecraft.util.thread.BlockableEventLoop.runAllTasks(BlockableEventLoop.java:114) ~[?:?]
at net.minecraft.server.MinecraftServer.tickServer(MinecraftServer.java:1530) ~[purpur-1.18.2.jar:git-Purpur-1612]
at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1246) ~[purpur-1.18.2.jar:git-Purpur-1612]
at net.minecraft.server.MinecraftServer.lambda$spin$1(MinecraftServer.java:320) ~[purpur-1.18.2.jar:git-Purpur-1612]
at java.lang.Thread.run(Thread.java:833) ~[?:?]
Caused by: java.lang.IllegalStateException: AnvilGUI does not support server version "1_18_R2"
at it.emmerrei.mycommand.utilities.anvilgui.VersionMatcher.match(VersionMatcher.java:26) ~[MyCommand.jar:?]
at it.emmerrei.mycommand.utilities.anvilgui.AnvilGUI.<clinit>(AnvilGUI.java:33) ~[MyCommand.jar:?]
... 28 more
Caused by: java.lang.ClassNotFoundException: it.emmerrei.mycommand.utilities.anvilgui.versions.Wrapper1_18_R2
at org.bukkit.plugin.java.PluginClassLoader.loadClass0(PluginClassLoader.java:153) ~[purpur-api-1.18.2-R0.1-SNAPSHOT.jar:?]
at org.bukkit.plugin.java.PluginClassLoader.loadClass(PluginClassLoader.java:105) ~[purpur-api-1.18.2-R0.1-SNAPSHOT.jar:?]
at java.lang.ClassLoader.loadClass(ClassLoader.java:520) ~[?:?]
at java.lang.Class.forName0(Native Method) ~[?:?]
at java.lang.Class.forName(Class.java:375) ~[?:?]
at it.emmerrei.mycommand.utilities.anvilgui.VersionMatcher.match(VersionMatcher.java:22) ~[MyCommand.jar:?]
at it.emmerrei.mycommand.utilities.anvilgui.AnvilGUI.<clinit>(AnvilGUI.java:33) ~[MyCommand.jar:?]
... 28 more