[13:31:34] [Server thread/ERROR]: Could not load 'plugins/IKB.jar' in folder 'plugins'
org.bukkit.plugin.InvalidDescriptionException: Invalid plugin.yml
	at org.bukkit.plugin.java.JavaPluginLoader.getPluginDescription(JavaPluginLoader.java:150) ~[patched_1.12.jar:git-Paper-1139]
	at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:136) [patched_1.12.jar:git-Paper-1139]
	at org.bukkit.craftbukkit.v1_12_R1.CraftServer.loadPlugins(CraftServer.java:303) [patched_1.12.jar:git-Paper-1139]
	at net.minecraft.server.v1_12_R1.DedicatedServer.init(DedicatedServer.java:223) [patched_1.12.jar:git-Paper-1139]
	at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:615) [patched_1.12.jar:git-Paper-1139]
	at java.lang.Thread.run(Thread.java:745) [?:1.8.0_91]
Caused by: java.io.FileNotFoundException: Jar does not contain plugin.yml
	... 6 more