Maincraft version: 1.20.1 forge
easyNPC version: easy_npc-forge-1.20.1-5.6.0.jar
plugin itemadder : ItemsAdder_3.6.4-release-2.jar

Everything is fine with the functions but when I make a trade I get the following error and the NPC opens the trading tab but does not show anything about the trading

next error in console

[06:26:14 WARN]: [ItemsAdder] Task #2079 for ItemsAdder v3.6.4-release-2 generated an exception
java.lang.AbstractMethodError: Receiver class de.markusbordihn.easynpc.entity.easynpc.npc.Villager does not define or inherit an implementation of the resolved method 'abstract org.bukkit.craftbukkit.v1_20_R1.inventory.CraftMerchant getCraftMerchant()' of interface net.minecraft.world.item.trading.Merchant.
at org.bukkit.craftbukkit.v1_20_R1.inventory.CraftInventoryMerchant.getMerchant(CraftInventoryMerchant.java:35) ~[forge-1.20.1-47.3.10-universal.jar%23345!/:?]
at ia.m.oX.a(SourceFile:87) ~[?:?]
at ia.m.oX.a(SourceFile:47) ~[?:?]
at org.bukkit.craftbukkit.v1_20_R1.scheduler.CraftTask.run(CraftTask.java:78) ~[forge-1.20.1-47.3.10-universal.jar%23345!/:?]
at org.bukkit.craftbukkit.v1_20_R1.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:416) ~[forge-1.20.1-47.3.10-universal.jar%23345!/:?]
at net.minecraft.server.MinecraftServer.m_5703_(MinecraftServer.java:1137) ~[server-1.20.1-20230612.114412-srg.jar%23340!/:?]
at net.minecraft.server.dedicated.DedicatedServer.m_5703_(DedicatedServer.java:360) ~[server-1.20.1-20230612.114412-srg.jar%23340!/:?]
at net.minecraft.server.MinecraftServer.m_5705_(MinecraftServer.java:1071) ~[server-1.20.1-20230612.114412-srg.jar%23340!/:?]
at net.minecraft.server.MinecraftServer.m_130011_(MinecraftServer.java:910) ~[server-1.20.1-20230612.114412-srg.jar%23340!/:?]
at net.minecraft.server.MinecraftServer.m_206580_(MinecraftServer.java:286) ~[server-1.20.1-20230612.114412-srg.jar%23340!/:?]
at java.lang.Thread.run(Thread.java:1583) [?:?]

....

According to the log, CraftInventoryMerchant expects a getCraftMerchant, which isn't defined for NPCs.
It seems that a Merchant plugin is assuming the NPC is a standard Trader entity, which it isn’t.

Are you using any specific Merchant or Trading plugin?
If so, I can take a closer look at their code. However, if the plugin is not open-source, there's not much I can do.
In that case, the issue should be reported to the plugin's developer, asking them to exclude Easy NPC entities from their modifications.

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