WorldGuard Loading Error

org.bukkit.plugin.InvalidPluginException: java.lang.NoClassDefFoundError: com/sk89q/minecraft/util/commands/CommandsManager
	at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:135) ~[city.jar:git-Spigot-5696c83-b1d149c]
	at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:327) ~[city.jar:git-Spigot-5696c83-b1d149c]
	at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:273) [city.jar:git-Spigot-5696c83-b1d149c]
	at org.bukkit.craftbukkit.v1_13_R2.CraftServer.loadPlugins(CraftServer.java:323) [city.jar:git-Spigot-5696c83-b1d149c]
	at net.minecraft.server.v1_13_R2.DedicatedServer.init(DedicatedServer.java:213) [city.jar:git-Spigot-5696c83-b1d149c]
	at net.minecraft.server.v1_13_R2.MinecraftServer.run(MinecraftServer.java:702) [city.jar:git-Spigot-5696c83-b1d149c]
	at java.lang.Thread.run(Unknown Source) [?:1.8.0_191]
Caused by: java.lang.NoClassDefFoundError: com/sk89q/minecraft/util/commands/CommandsManager
	at java.lang.Class.forName0(Native Method) ~[?:1.8.0_191]
	at java.lang.Class.forName(Unknown Source) ~[?:1.8.0_191]
	at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:78) ~[city.jar:git-Spigot-5696c83-b1d149c]
	at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:131) ~[city.jar:git-Spigot-5696c83-b1d149c]
	... 6 more
Caused by: java.lang.ClassNotFoundException: com.sk89q.minecraft.util.commands.CommandsManager
	at java.net.URLClassLoader.findClass(Unknown Source) ~[?:1.8.0_191]
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:154) ~[city.jar:git-Spigot-5696c83-b1d149c]
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:100) ~[city.jar:git-Spigot-5696c83-b1d149c]
	at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_191]
	at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_191]
	at java.lang.Class.forName0(Native Method) ~[?:1.8.0_191]
	at java.lang.Class.forName(Unknown Source) ~[?:1.8.0_191]
	at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:78) ~[city.jar:git-Spigot-5696c83-b1d149c]
	at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:131) ~[city.jar:git-Spigot-5696c83-b1d149c]
	... 6 more