[00:21:21] [Server thread/ERROR]: Could not load 'plugins/LauncherAuthlib.jar' in folder 'plugins'
org.bukkit.plugin.InvalidDescriptionException: Invalid plugin.yml
    at org.bukkit.plugin.java.JavaPluginLoader.getPluginDescription(JavaPluginLoader.java:188) ~[JavaPluginLoader.class:1.7.10-1614.58]
    at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:133) [SimplePluginManager.class:1.7.10-1614.58]
    at org.bukkit.craftbukkit.v1_7_R4.CraftServer.loadPlugins(CraftServer.java:343) [CraftServer.class:1.7.10-1614.58]
    at net.minecraft.world.storage.SaveHandler.initBukkitData(SaveHandler.java:462) [ayq.class:?]
    at net.minecraft.world.storage.SaveHandler.func_75757_d(SaveHandler.java:138) [ayq.class:?]
    at net.minecraft.world.World.<init>(World.java:374) [ahb.class:?]
    at net.minecraft.world.WorldServer.<init>(WorldServer.java:162) [mt.class:?]
    at net.minecraft.server.MinecraftServer.func_71247_a(MinecraftServer.java:375) [MinecraftServer.class:?]
    at net.minecraft.server.dedicated.DedicatedServer.func_71197_b(DedicatedServer.java:337) [lt.class:?]
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:643) [MinecraftServer.class:?]
    at java.lang.Thread.run(Thread.java:748) [?:1.8.0_191]
Caused by: java.io.FileNotFoundException: Jar does not contain plugin.yml
    ... 11 more