usb error

[00:20:15] [Server thread/INFO]: [uSkyBlock] Enabling uSkyBlock v2.7.6-RC3
[00:20:15] [Server thread/INFO]: No plugins/uSkyBlock/config.yml found, it will be created
[00:20:15] [Server thread/ERROR]: Error occurred while enabling uSkyBlock v2.7.6-RC3 (Is it up to date?)
java.lang.NoClassDefFoundError: com/sk89q/worldedit/Vector
	at us.talabrek.ultimateskyblock.Settings.loadPluginConfig(Settings.java:143) ~[?:?]
	at us.talabrek.ultimateskyblock.uSkyBlock.reloadConfigs(uSkyBlock.java:988) ~[?:?]
	at us.talabrek.ultimateskyblock.uSkyBlock.onEnable(uSkyBlock.java:222) ~[?:?]
	at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:254) ~[spigot-1.13.2.jar:git-Spigot-518206a-a5b9c7b]
	at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:340) [spigot-1.13.2.jar:git-Spigot-518206a-a5b9c7b]
	at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:403) [spigot-1.13.2.jar:git-Spigot-518206a-a5b9c7b]
	at org.bukkit.craftbukkit.v1_13_R2.CraftServer.enablePlugin(CraftServer.java:434) [spigot-1.13.2.jar:git-Spigot-518206a-a5b9c7b]
	at org.bukkit.craftbukkit.v1_13_R2.CraftServer.enablePlugins(CraftServer.java:348) [spigot-1.13.2.jar:git-Spigot-518206a-a5b9c7b]
	at net.minecraft.server.v1_13_R2.DedicatedServer.init(DedicatedServer.java:214) [spigot-1.13.2.jar:git-Spigot-518206a-a5b9c7b]
	at net.minecraft.server.v1_13_R2.MinecraftServer.run(MinecraftServer.java:697) [spigot-1.13.2.jar:git-Spigot-518206a-a5b9c7b]
	at java.lang.Thread.run(Thread.java:748) [?:1.8.0_171]
Caused by: java.lang.ClassNotFoundException: com.sk89q.worldedit.Vector
	at java.net.URLClassLoader.findClass(URLClassLoader.java:381) ~[?:1.8.0_171]
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:134) ~[spigot-1.13.2.jar:git-Spigot-518206a-a5b9c7b]
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:80) ~[spigot-1.13.2.jar:git-Spigot-518206a-a5b9c7b]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:1.8.0_171]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_171]
	... 11 more
-----------------------------------------------------------------------------------------------------------------------------
[00:28:25] [Server thread/INFO]: Stopping server
[00:28:25] [Server thread/INFO]: [uSkyBlock] Disabling uSkyBlock v2.7.6-RC3
[00:28:25] [Server thread/ERROR]: Error occurred while disabling uSkyBlock v2.7.6-RC3 (Is it up to date?)
java.lang.NullPointerException: null
	at us.talabrek.ultimateskyblock.uSkyBlock.onDisable(uSkyBlock.java:198) ~[?:?]
	at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:256) ~[spigot-1.13.2.jar:git-Spigot-518206a-a5b9c7b]
	at org.bukkit.plugin.java.JavaPluginLoader.disablePlugin(JavaPluginLoader.java:364) [spigot-1.13.2.jar:git-Spigot-518206a-a5b9c7b]
	at org.bukkit.plugin.SimplePluginManager.disablePlugin(SimplePluginManager.java:422) [spigot-1.13.2.jar:git-Spigot-518206a-a5b9c7b]
	at org.bukkit.plugin.SimplePluginManager.disablePlugins(SimplePluginManager.java:415) [spigot-1.13.2.jar:git-Spigot-518206a-a5b9c7b]
	at org.bukkit.craftbukkit.v1_13_R2.CraftServer.disablePlugins(CraftServer.java:368) [spigot-1.13.2.jar:git-Spigot-518206a-a5b9c7b]
	at net.minecraft.server.v1_13_R2.MinecraftServer.stop(MinecraftServer.java:620) [spigot-1.13.2.jar:git-Spigot-518206a-a5b9c7b]
	at net.minecraft.server.v1_13_R2.MinecraftServer.run(MinecraftServer.java:765) [spigot-1.13.2.jar:git-Spigot-518206a-a5b9c7b]
	at java.lang.Thread.run(Thread.java:748) [?:1.8.0_171]