Hello, I downloaded both versions of ItemUtils1.0 and ran them on my paper version 1.20.6 server, but the server backend still reported an error and could not be used normally. The author needs to fix it.

[23:33:47] [Server thread/WARN]: [ItemUtils] Task #21 for ItemUtils v1.0.0 generated an exception
java.lang.NoClassDefFoundError: org/bukkit/craftbukkit/v1_21_R1/entity/CraftItem
at ItemUtils-1.0.0.jar/dev.efekos.iu.events.EntityEvents.getAge(EntityEvents.java:91) ~[ItemUtils-1.0.0.jar:?]
at ItemUtils-1.0.0.jar/dev.efekos.iu.events.EntityEvents$1.lambda$run$1(EntityEvents.java:79) ~[ItemUtils-1.0.0.jar:?]
at java.base/java.util.HashMap.forEach(HashMap.java:1429) ~[?:?]
at ItemUtils-1.0.0.jar/dev.efekos.iu.events.EntityEvents$1.run(EntityEvents.java:64) ~[ItemUtils-1.0.0.jar:?]
at org.bukkit.craftbukkit.scheduler.CraftTask.run(CraftTask.java:101) ~[paper-1.20.6.jar:1.20.6-147-e41d44f]
at org.bukkit.craftbukkit.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:482) ~[paper-1.20.6.jar:1.20.6-147-e41d44f]
at net.minecraft.server.MinecraftServer.tickChildren(MinecraftServer.java:1699) ~[paper-1.20.6.jar:1.20.6-147-e41d44f]
at net.minecraft.server.dedicated.DedicatedServer.tickChildren(DedicatedServer.java:467) ~[paper-1.20.6.jar:1.20.6-147-e41d44f]
at net.minecraft.server.MinecraftServer.tickServer(MinecraftServer.java:1571) ~[paper-1.20.6.jar:1.20.6-147-e41d44f]
at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1231) ~[paper-1.20.6.jar:1.20.6-147-e41d44f]
at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:323) ~[paper-1.20.6.jar:1.20.6-147-e41d44f]
at java.base/java.lang.Thread.run(Thread.java:1570) ~[?:?]
Caused by: java.lang.ClassNotFoundException: org.bukkit.craftbukkit.v1_21_R1.entity.CraftItem
... 12 more