[22:27:31 ERROR]: Could not pass event InventoryClickEvent to Shopkeepers v1.38
org.bukkit.event.EventException
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:302) ~[spigot.jar:git-Spigot-1.7.9-R0.2-205-g0a049fa]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[spigot.jar:git-Spigot-1.7.9-R0.2-205-g0a049fa]
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:509) [spigot.jar:git-Spigot-1.7.9-R0.2-205-g0a049fa]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:494) [spigot.jar:git-Spigot-1.7.9-R0.2-205-g0a049fa]
        at net.minecraft.server.v1_7_R4.PlayerConnection.a(PlayerConnection.java:1477) [spigot.jar:git-Spigot-1.7.9-R0.2-205-g0a049fa]
        at net.minecraft.server.v1_7_R4.PacketPlayInWindowClick.a(PacketPlayInWindowClick.java:15) [spigot.jar:git-Spigot-1.7.9-R0.2-205-g0a049fa]
        at net.minecraft.server.v1_7_R4.PacketPlayInWindowClick.handle(PacketPlayInWindowClick.java:65) [spigot.jar:git-Spigot-1.7.9-R0.2-205-g0a049fa]
        at net.minecraft.server.v1_7_R4.NetworkManager.a(NetworkManager.java:186) [spigot.jar:git-Spigot-1.7.9-R0.2-205-g0a049fa]
        at net.minecraft.server.v1_7_R4.ServerConnection.c(ServerConnection.java:81) [spigot.jar:git-Spigot-1.7.9-R0.2-205-g0a049fa]
        at net.minecraft.server.v1_7_R4.MinecraftServer.v(MinecraftServer.java:734) [spigot.jar:git-Spigot-1.7.9-R0.2-205-g0a049fa]
        at net.minecraft.server.v1_7_R4.DedicatedServer.v(DedicatedServer.java:289) [spigot.jar:git-Spigot-1.7.9-R0.2-205-g0a049fa]
        at net.minecraft.server.v1_7_R4.MinecraftServer.u(MinecraftServer.java:584) [spigot.jar:git-Spigot-1.7.9-R0.2-205-g0a049fa]
        at net.minecraft.server.v1_7_R4.MinecraftServer.run(MinecraftServer.java:490) [spigot.jar:git-Spigot-1.7.9-R0.2-205-g0a049fa]
        at net.minecraft.server.v1_7_R4.ThreadServerApplication.run(SourceFile:628) [spigot.jar:git-Spigot-1.7.9-R0.2-205-g0a049fa]
Caused by: java.lang.NoClassDefFoundError: org/bukkit/inventory/meta/BannerMeta
        at com.nisovin.shopkeepers.Utils.areSimilarReasoned(Utils.java:369) ~[?:?]
        at com.nisovin.shopkeepers.Utils.areSimilar(Utils.java:125) ~[?:?]
        at com.nisovin.shopkeepers.ui.defaults.TradingHandler.itemEqualsAtLeast(TradingHandler.java:191) ~[?:?]
        at com.nisovin.shopkeepers.ui.defaults.TradingHandler.onInventoryClick(TradingHandler.java:114) ~[?:?]
        at com.nisovin.shopkeepers.ui.UIListener.onInventoryClick(UIListener.java:52) ~[?:?]
        at sun.reflect.GeneratedMethodAccessor360.invoke(Unknown Source) ~[?:?]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.7.0_65]
        at java.lang.reflect.Method.invoke(Method.java:606) ~[?:1.7.0_65]
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:298) ~[spigot.jar:git-Spigot-1.7.9-R0.2-205-g0a049fa]