Migrated from: https://dev.bukkit.org/projects/shopkeepers/issues/520

Originally posted by allen (Mar 21, 2017):

hi,
 
Everything is good in the config. I can't set shop and change price..etc but when I right click on the NPC for trade. Nothing appears except a big message in the console :
 
Spoiler (click to show)
[11:44:26 ERROR]: Could not pass event PlayerInteractEntityEvent to Shopkeepers v1.81
org.bukkit.event.EventException
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:306) ~[craftbukkit.jar:git-Spigot-d60de0a-a951a88]
at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[craftbukkit.jar:git-Spigot-d60de0a-a951a88]
at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502) [craftbukkit.jar:git-Spigot-d60de0a-a951a88]
at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487) [craftbukkit.jar:git-Spigot-d60de0a-a951a88]
at net.minecraft.server.v1_11_R1.PlayerConnection.a(PlayerConnection.java:1518) [craftbukkit.jar:git-Spigot-d60de0a-a951a88]
at net.minecraft.server.v1_11_R1.PacketPlayInUseEntity.a(SourceFile:69) [craftbukkit.jar:git-Spigot-d60de0a-a951a88]
at net.minecraft.server.v1_11_R1.PacketPlayInUseEntity.a(SourceFile:13) [craftbukkit.jar:git-Spigot-d60de0a-a951a88]
at net.minecraft.server.v1_11_R1.PlayerConnectionUtils$1.run(SourceFile:13) [craftbukkit.jar:git-Spigot-d60de0a-a951a88]
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.7.0_71]
at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.7.0_71]
at net.minecraft.server.v1_11_R1.SystemUtils.a(SourceFile:46) [craftbukkit.jar:git-Spigot-d60de0a-a951a88]
at net.minecraft.server.v1_11_R1.MinecraftServer.D(MinecraftServer.java:739) [craftbukkit.jar:git-Spigot-d60de0a-a951a88]
at net.minecraft.server.v1_11_R1.DedicatedServer.D(DedicatedServer.java:399) [craftbukkit.jar:git-Spigot-d60de0a-a951a88]
at net.minecraft.server.v1_11_R1.MinecraftServer.C(MinecraftServer.java:675) [craftbukkit.jar:git-Spigot-d60de0a-a951a88]
at net.minecraft.server.v1_11_R1.MinecraftServer.run(MinecraftServer.java:574) [craftbukkit.jar:git-Spigot-d60de0a-a951a88]
at java.lang.Thread.run(Unknown Source) [?:1.7.0_71]
Caused by: java.lang.NoSuchMethodError: org.bukkit.Bukkit.createMerchant(Ljava/lang/String;)Lorg/bukkit/inventory/Merchant;
at com.nisovin.shopkeepers.compat.v1_11_R1.NMSHandler.openTradeWindow(NMSHandler.java:42) ~[?:?]
at com.nisovin.shopkeepers.ui.defaults.TradingHandler.openWindow(TradingHandler.java:63) ~[?:?]
at com.nisovin.shopkeepers.ui.UIManager.requestUI(UIManager.java:77) ~[?:?]
at com.nisovin.shopkeepers.Shopkeeper.openWindow(Shopkeeper.java:422) ~[?:?]
at com.nisovin.shopkeepers.Shopkeeper.openTradingWindow(Shopkeeper.java:446) ~[?:?]
at com.nisovin.shopkeepers.Shopkeeper.onPlayerInteraction(Shopkeeper.java:543) ~[?:?]
at com.nisovin.shopkeepers.shoptypes.PlayerShopkeeper.onPlayerInteraction(PlayerShopkeeper.java:452) ~[?:?]
at com.nisovin.shopkeepers.LivingEntityShopListener.onEntityInteract(LivingEntityShopListener.java:58) ~[?:?]
at sun.reflect.GeneratedMethodAccessor166.invoke(Unknown Source) ~[?:?]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.7.0_71]
at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.7.0_71]
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:302) ~[craftbukkit.jar:git-Spigot-d60de0a-a951a88]
... 15 more

 Any ideas ?
Have a good day ;-)

Originally commented by blablubbabc (Mar 21, 2017):

You have to update your server. Shopkeepers is using API which isn't yet available in your version of spigot.

Originally closed by blablubbabc (Mar 21, 2017)

Originally commented by allen (Apr 1, 2017):

thx problem solved !