1.21 Items only show as pieces of paper

Terms

[X] I'm using the very latest version of ItemsAdder and its dependencies.
[X] I am sure this is a bug and it is not caused by a misconfiguration or by another plugin.
[X] I already searched on this Github page to check if the same issue was already reported.
[X] I already searched on the plugin wiki to know if a solution is already known.
[X] I already searched on the forums to check if anyone already has a solution for this.

Discord tag (optional)

No response

What happened?

Updated Minecraft to latest version Spigot 1.21 along with 4.0.2-alpha-test-3 of IA and latest LoneLibs... I tried running the server and /ia didn't bring up the GUI. and all custom items were paper.

I removed the itemsadder folder from the plugins folder to have it gresh install. When I do /ia the menu pops up but still everything is paper.

I further tested by removing all other plugins.. same issue. the items dont load in. Not even the internal items.

I appreciate the hard work that is put into this I just wanted to make sure these issues are known so that when you have the time you can fix this as well.

Steps to reproduce the issue

install latest version 4.0.2-alpha-test-3 and latest spigot version and launch the server on Gportal

Server version

This server is running CraftBukkit version 4213-Spigot-146439e-f5a63f7 (MC: 1.21) (Implementing API version 1.21-R0.1-SNAPSHOT)

ItemsAdder Version

4.0.2-alpha-test-3

ProtocolLib Version

5.3.0-SNAPSHOT-726

LoneLibs Version

1.0.56

Full server log

https://mclo.gs/hIXvNsu

Error (optional)

[16:34:56] [Server thread/ERROR]: [ItemsAdder] Invalid character in folders/name of file: Roasted Chicken
Skipped some lines of output
[16:34:56] [Server thread/ERROR]: [ItemsAdder] Error loading the plugin, something is not configured right or an exception occured. More detail:
[16:34:56] [Server thread/WARN]: java.lang.IllegalAccessError: class lonelibs.dev.lone.fastnbt.nms.nbt.CraftItemStack_v1_21 tried to access field org.bukkit.craftbukkit.v1_21_R1.inventory.CraftItemStack.handle (lonelibs.dev.lone.fastnbt.nms.nbt.CraftItemStack_v1_21 is in unnamed module of loader org.bukkit.plugin.java.PluginClassLoader @68b96184; org.bukkit.craftbukkit.v1_21_R1.inventory.CraftItemStack is in unnamed module of loader java.net.URLClassLoader @65b3120a)

Problematic items yml configuration file (optional)

No response

Other files, you can drag and drop them here to upload. (optional)

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Screenshots/Videos (you can drag and drop files or paste links)

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PluginBugs / Issues-ItemsAdder