[19:38:01] [Server thread/ERROR]: Could not load 'plugins\RandomDrop.jar' in folder 'plugins'
org.bukkit.plugin.InvalidPluginException: java.lang.NoClassDefFoundError: net/minecraft/server/v1_10_R1/Packet
    at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:133) ~[spigot-latest.jar:git-Spigot-3fb9445-2b6c9f4]
    at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:329) ~[spigot-latest.jar:git-Spigot-3fb9445-2b6c9f4]
    at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:251) [spigot-latest.jar:git-Spigot-3fb9445-2b6c9f4]
    at org.bukkit.craftbukkit.v1_11_R1.CraftServer.loadPlugins(CraftServer.java:301) [spigot-latest.jar:git-Spigot-3fb9445-2b6c9f4]
    at net.minecraft.server.v1_11_R1.DedicatedServer.init(DedicatedServer.java:204) [spigot-latest.jar:git-Spigot-3fb9445-2b6c9f4]
    at net.minecraft.server.v1_11_R1.MinecraftServer.run(MinecraftServer.java:544) [spigot-latest.jar:git-Spigot-3fb9445-2b6c9f4]
    at java.lang.Thread.run(Unknown Source) [?:1.8.0_121]
Caused by: java.lang.NoClassDefFoundError: net/minecraft/server/v1_10_R1/Packet
    at java.lang.Class.forName0(Native Method) ~[?:1.8.0_121]
    at java.lang.Class.forName(Unknown Source) ~[?:1.8.0_121]
    at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:64) ~[spigot-latest.jar:git-Spigot-3fb9445-2b6c9f4]
    at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:129) ~[spigot-latest.jar:git-Spigot-3fb9445-2b6c9f4]
    ... 6 more
Caused by: java.lang.ClassNotFoundException: net.minecraft.server.v1_10_R1.Packet
    at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:91) ~[spigot-latest.jar:git-Spigot-3fb9445-2b6c9f4]
    at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:86) ~[spigot-latest.jar:git-Spigot-3fb9445-2b6c9f4]
    at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_121]
    at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_121]
    at java.lang.Class.forName0(Native Method) ~[?:1.8.0_121]
    at java.lang.Class.forName(Unknown Source) ~[?:1.8.0_121]
    at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:64) ~[spigot-latest.jar:git-Spigot-3fb9445-2b6c9f4]
    at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:129) ~[spigot-latest.jar:git-Spigot-3fb9445-2b6c9f4]
    ... 6 more