minecraft plugin bug

[14:45:42] [Server thread/ERROR]: Could not pass event InventoryClickEvent to UltimateKits v2.3.24
org.bukkit.event.EventException: null
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:312) ~[server.jar:git-Bukkit-03b145b]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:70) ~[server.jar:git-Bukkit-03b145b]
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:528) ~[server.jar:git-Bukkit-03b145b]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:513) ~[server.jar:git-Bukkit-03b145b]
        at net.minecraft.server.v1_14_R1.PlayerConnection.a(PlayerConnection.java:2073) ~[server.jar:git-Bukkit-03b145b]
        at net.minecraft.server.v1_14_R1.PacketPlayInWindowClick.a(SourceFile:33) ~[server.jar:git-Bukkit-03b145b]
        at net.minecraft.server.v1_14_R1.PacketPlayInWindowClick.a(SourceFile:10) ~[server.jar:git-Bukkit-03b145b]
        at net.minecraft.server.v1_14_R1.PlayerConnectionUtils.lambda$0(PlayerConnectionUtils.java:19) ~[server.jar:git-Bukkit-03b145b]
        at net.minecraft.server.v1_14_R1.TickTask.run(SourceFile:18) [server.jar:git-Bukkit-03b145b]
        at net.minecraft.server.v1_14_R1.IAsyncTaskHandler.executeTask(SourceFile:144) [server.jar:git-Bukkit-03b145b]
        at net.minecraft.server.v1_14_R1.IAsyncTaskHandlerReentrant.executeTask(SourceFile:23) [server.jar:git-Bukkit-03b145b]
        at net.minecraft.server.v1_14_R1.IAsyncTaskHandler.executeNext(SourceFile:118) [server.jar:git-Bukkit-03b145b]
        at net.minecraft.server.v1_14_R1.MinecraftServer.aX(MinecraftServer.java:867) [server.jar:git-Bukkit-03b145b]
        at net.minecraft.server.v1_14_R1.MinecraftServer.executeNext(MinecraftServer.java:860) [server.jar:git-Bukkit-03b145b]
        at net.minecraft.server.v1_14_R1.IAsyncTaskHandler.executeAll(SourceFile:103) [server.jar:git-Bukkit-03b145b]
        at net.minecraft.server.v1_14_R1.MinecraftServer.sleepForTick(MinecraftServer.java:843) [server.jar:git-Bukkit-03b145b]
        at net.minecraft.server.v1_14_R1.MinecraftServer.run(MinecraftServer.java:784) [server.jar:git-Bukkit-03b145b]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_181]
Caused by: java.lang.NoSuchMethodError: net.milkbowl.vault.economy.Economy.has(Lorg/bukkit/OfflinePlayer;D)Z
        at com.songoda.ultimatekits.economy.VaultEconomy.hasBalance(VaultEconomy.java:16) ~[?:?]
        at com.songoda.ultimatekits.kit.Kit.processPurchaseUse(Kit.java:148) ~[?:?]
        at com.songoda.ultimatekits.gui.GUIConfirmBuy.lambda$registerClickables$0(GUIConfirmBuy.java:86) ~[?:?]
        at com.songoda.ultimatekits.utils.gui.AbstractGUI$1.onClickGUI(AbstractGUI.java:87) ~[?:?]
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_181]
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_181]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_181]
        at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_181]
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:310) ~[server.jar:git-Bukkit-03b145b]
        ... 17 more