[13:31:58] [Server thread/ERROR]: Error occurred while enabling RepairMeUp v1.0 (Is it up to date?)
 java.lang.NoClassDefFoundError: net/minecraft/command/ICommandSender
        at pt.licious.repairmeup.RepairMeUp.onEnable(RepairMeUp.java:14) ~[?:?]
        at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:263) ~[forge:?]
        at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:351) ~[forge:?]
        at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:483) ~[forge:?]
        at org.bukkit.craftbukkit.v1_16_R3.CraftServer.enablePlugin(CraftServer.java:412) ~[forge:1.16.5-c9bc6751]
        at org.bukkit.craftbukkit.v1_16_R3.CraftServer.enablePlugins(CraftServer.java:323) ~[forge:1.16.5-c9bc6751]
        at net.minecraft.server.MinecraftServer.func_240787_a_(MinecraftServer.java:439) ~[?:?]
        at net.minecraft.server.MinecraftServer.func_240800_l__(MinecraftServer.java:345) ~[?:?]
        at net.minecraft.server.dedicated.DedicatedServer.func_71197_b(DedicatedServer.java:220) ~[?:?]
        at net.minecraft.server.MinecraftServer.func_240802_v_(MinecraftServer.java:739) ~[?:?]
        at net.minecraft.server.MinecraftServer.func_240783_a_(MinecraftServer.java:265) ~[?:?]
        at java.lang.Thread.run(Thread.java:829) [?:?]
Caused by: java.lang.ClassNotFoundException: net.minecraft.command.ICommandSender
        at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:175) ~[forge:?]
        at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:124) ~[forge:?]
        at java.lang.ClassLoader.loadClass(ClassLoader.java:589) ~[?:?]
        at java.lang.ClassLoader.loadClass(ClassLoader.java:522) ~[?:?]
        ... 12 more
Caused by: java.lang.ClassNotFoundException: net.minecraft.command.ICommandSender
        at java.lang.ClassLoader.findClass(ClassLoader.java:719) ~[?:?]
        at java.lang.ClassLoader.loadClass(ClassLoader.java:589) ~[?:?]
        at cpw.mods.modlauncher.TransformingClassLoader.loadClass(TransformingClassLoader.java:106) ~[modlauncher-8.1.3.jar:?]
        at java.lang.ClassLoader.loadClass(ClassLoader.java:522) ~[?:?]
        at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:173) ~[forge:?]
        at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:124) ~[forge:?]
        at java.lang.ClassLoader.loadClass(ClassLoader.java:589) ~[?:?]
        at java.lang.ClassLoader.loadClass(ClassLoader.java:522) ~[?:?]
        ... 12 more
        Suppressed: java.lang.ClassNotFoundException
                at cpw.mods.modlauncher.TransformingClassLoader$DelegatedClassLoader.findClass(TransformingClassLoader.java:282) ~[modlauncher-8.1.3.jar:?]
                at cpw.mods.modlauncher.TransformingClassLoader.loadClass(TransformingClassLoader.java:136) ~[modlauncher-8.1.3.jar:?]
                at cpw.mods.modlauncher.TransformingClassLoader.loadClass(TransformingClassLoader.java:98) ~[modlauncher-8.1.3.jar:?]
                at java.lang.ClassLoader.loadClass(ClassLoader.java:522) ~[?:?]
                at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:173) ~[forge:?]
                at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:124) ~[forge:?]
                at java.lang.ClassLoader.loadClass(ClassLoader.java:589) ~[?:?]
                at java.lang.ClassLoader.loadClass(ClassLoader.java:522) ~[?:?]
                at pt.licious.repairmeup.RepairMeUp.onEnable(RepairMeUp.java:14) ~[?:?]
                at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:263) ~[forge:?]
                at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:351) ~[forge:?]
                at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:483) ~[forge:?]
                at org.bukkit.craftbukkit.v1_16_R3.CraftServer.enablePlugin(CraftServer.java:412) ~[forge:1.16.5-c9bc6751]
                at org.bukkit.craftbukkit.v1_16_R3.CraftServer.enablePlugins(CraftServer.java:323) ~[forge:1.16.5-c9bc6751]
                at net.minecraft.server.MinecraftServer.func_240787_a_(MinecraftServer.java:439) ~[?:?]
                at net.minecraft.server.MinecraftServer.func_240800_l__(MinecraftServer.java:345) ~[?:?]
                at net.minecraft.server.dedicated.DedicatedServer.func_71197_b(DedicatedServer.java:220) ~[?:?]
                at net.minecraft.server.MinecraftServer.func_240802_v_(MinecraftServer.java:739) ~[?:?]
                at net.minecraft.server.MinecraftServer.func_240783_a_(MinecraftServer.java:265) ~[?:?]
                at java.lang.Thread.run(Thread.java:829) [?:?]