Why is GUI shop broken?

[Cashtastrophie]

[19:59:30 INFO]: Cashtastrophie issued server command: /buy

[19:59:30 ERROR]: null

org.bukkit.command.CommandException: Unhandled exception executing 'buy' in com.pablo67340.guishop.commands.BuyCommand(shop)

	at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:169) ~[patched_1.17.1.jar:git-Paper-408]

	at org.bukkit.craftbukkit.v1_17_R1.CraftServer.dispatchCommand(CraftServer.java:869) ~[patched_1.17.1.jar:git-Paper-408]

	at net.minecraft.server.network.ServerGamePacketListenerImpl.handleCommand(ServerGamePacketListenerImpl.java:2262) ~[app:?]

	at net.minecraft.server.network.ServerGamePacketListenerImpl.handleChat(ServerGamePacketListenerImpl.java:2073) ~[app:?]

	at net.minecraft.server.network.ServerGamePacketListenerImpl.handleChat(ServerGamePacketListenerImpl.java:2054) ~[app:?]

	at net.minecraft.network.protocol.game.ServerboundChatPacket.handle(ServerboundChatPacket.java:46) ~[app:?]

	at net.minecraft.network.protocol.game.ServerboundChatPacket.a(ServerboundChatPacket.java:6) ~[app:?]

	at net.minecraft.network.protocol.PacketUtils.lambda$ensureRunningOnSameThread$1(PacketUtils.java:56) ~[app:?]

	at net.minecraft.server.TickTask.run(TickTask.java:18) ~[patched_1.17.1.jar:git-Paper-408]

	at net.minecraft.util.thread.BlockableEventLoop.doRunTask(BlockableEventLoop.java:149) ~[app:?]

	at net.minecraft.util.thread.ReentrantBlockableEventLoop.doRunTask(ReentrantBlockableEventLoop.java:23) ~[app:?]

	at net.minecraft.server.MinecraftServer.doRunTask(MinecraftServer.java:1426) ~[patched_1.17.1.jar:git-Paper-408]

	at net.minecraft.server.MinecraftServer.executeTask(MinecraftServer.java:192) ~[patched_1.17.1.jar:git-Paper-408]

	at net.minecraft.util.thread.BlockableEventLoop.pollTask(BlockableEventLoop.java:122) ~[app:?]

	at net.minecraft.server.MinecraftServer.pollTaskInternal(MinecraftServer.java:1404) ~[patched_1.17.1.jar:git-Paper-408]

	at net.minecraft.server.MinecraftServer.pollTask(MinecraftServer.java:1397) ~[patched_1.17.1.jar:git-Paper-408]

	at net.minecraft.util.thread.BlockableEventLoop.runAllTasks(BlockableEventLoop.java:110) ~[app:?]

	at net.minecraft.server.MinecraftServer.tickServer(MinecraftServer.java:1536) ~[patched_1.17.1.jar:git-Paper-408]

	at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1282) ~[patched_1.17.1.jar:git-Paper-408]

	at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:319) ~[patched_1.17.1.jar:git-Paper-408]

	at java.lang.Thread.run(Thread.java:833) ~[?:?]

Caused by: java.lang.NoClassDefFoundError: Could not initialize class com.github.stefvanschie.inventoryframework.shade.mininbt.NBTWrappers$NBTTagCompound

	at com.github.stefvanschie.inventoryframework.shade.mininbt.ItemNBTUtil.getTag(ItemNBTUtil.java:82) ~[GUIShop.jar:?]

	at com.github.stefvanschie.inventoryframework.GuiItem.<init>(GuiItem.java:57) ~[GUIShop.jar:?]

	at com.github.stefvanschie.inventoryframework.GuiItem.<init>(GuiItem.java:70) ~[GUIShop.jar:?]

	at com.pablo67340.guishop.listenable.Menu.loadMenu(Menu.java:130) ~[GUIShop.jar:?]

	at com.pablo67340.guishop.listenable.Menu.loadItems(Menu.java:106) ~[GUIShop.jar:?]

	at com.pablo67340.guishop.listenable.Menu.open(Menu.java:215) ~[GUIShop.jar:?]

	at com.pablo67340.guishop.listenable.PlayerListener.openShop(PlayerListener.java:37) ~[GUIShop.jar:?]

	at com.pablo67340.guishop.commands.GuishopUserCommand.buyCommand(GuishopUserCommand.java:56) ~[GUIShop.jar:?]

	at com.pablo67340.guishop.commands.BuyCommand.execute(BuyCommand.java:22) ~[GUIShop.jar:?]

	at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:159) ~[patched_1.17.1.jar:git-Paper-408]

	... 20 more
Idk why