[00:55:09 ERROR]: Could not load 'plugins\skript.jar' in folder 'plugins'
org.bukkit.plugin.InvalidPluginException: Cannot find main class `ch.njol.skript.Skript'
        at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:66) ~[spigot-1.9.jar:git-Spigot-3af4605-ed8cef0]
        at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:131) ~[spigot-1.9.jar:git-Spigot-3af4605-ed8cef0]
        at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:329) ~[spigot-1.9.jar:git-Spigot-3af4605-ed8cef0]
        at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:251) [spigot-1.9.jar:git-Spigot-3af4605-ed8cef0]
        at org.bukkit.craftbukkit.v1_9_R1.CraftServer.loadPlugins(CraftServer.java:296) [spigot-1.9.jar:git-Spigot-3af4605-ed8cef0]
        at net.minecraft.server.v1_9_R1.DedicatedServer.init(DedicatedServer.java:201) [spigot-1.9.jar:git-Spigot-3af4605-ed8cef0]
        at net.minecraft.server.v1_9_R1.MinecraftServer.run(MinecraftServer.java:527) [spigot-1.9.jar:git-Spigot-3af4605-ed8cef0]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_74]
Caused by: java.lang.ClassNotFoundException: ch.njol.skript.Skript
        at java.net.URLClassLoader.findClass(Unknown Source) ~[?:1.8.0_74]
        at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:101) ~[spigot-1.9.jar:git-Spigot-3af4605-ed8cef0]
        at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:86) ~[spigot-1.9.jar:git-Spigot-3af4605-ed8cef0]
        at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_74]
        at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_74]
        at java.lang.Class.forName0(Native Method) ~[?:1.8.0_74]
        at java.lang.Class.forName(Unknown Source) ~[?:1.8.0_74]
        at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:64) ~[spigot-1.9.jar:git-Spigot-3af4605-ed8cef0]
        ... 7 more
[00:55:09 ERROR]: Could not load 'plugins\Umbask.jar' in folder 'plugins'
org.bukkit.plugin.UnknownDependencyException: Skript
        at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:219) [spigot-1.9.jar:git-Spigot-3af4605-ed8cef0]
        at org.bukkit.craftbukkit.v1_9_R1.CraftServer.loadPlugins(CraftServer.java:296) [spigot-1.9.jar:git-Spigot-3af4605-ed8cef0]
        at net.minecraft.server.v1_9_R1.DedicatedServer.init(DedicatedServer.java:201) [spigot-1.9.jar:git-Spigot-3af4605-ed8cef0]
        at net.minecraft.server.v1_9_R1.MinecraftServer.run(MinecraftServer.java:527) [spigot-1.9.jar:git-Spigot-3af4605-ed8cef0]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_74]