Error

[22:06:06] [Server thread/ERROR]: Could not load 'plugins\LeaderboardExtensions.jar' in folder 'plugins'
org.bukkit.plugin.InvalidDescriptionException: Invalid plugin.yml
	at org.bukkit.plugin.java.JavaPluginLoader.getPluginDescription(JavaPluginLoader.java:154) ~[spigot.jar:git-Spigot-ec3f46e-2359f6f]
	at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:133) [spigot.jar:git-Spigot-ec3f46e-2359f6f]
	at org.bukkit.craftbukkit.v1_8_R3.CraftServer.loadPlugins(CraftServer.java:291) [spigot.jar:git-Spigot-ec3f46e-2359f6f]
	at net.minecraft.server.v1_8_R3.DedicatedServer.init(DedicatedServer.java:198) [spigot.jar:git-Spigot-ec3f46e-2359f6f]
	at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:524) [spigot.jar:git-Spigot-ec3f46e-2359f6f]
	at java.lang.Thread.run(Thread.java:745) [?:1.8.0_45]
Caused by: java.io.FileNotFoundException: Jar does not contain plugin.yml
	... 6 more