Skin-Manager Error

Header :
java.io.FileInputStream.open0(Native Method)
java.io.FileInputStream.open(FileInputStream.java:195)
java.io.FileInputStream.<init>(FileInputStream.java:138)
java.util.Scanner.<init>(Scanner.java:611)
me.kitt3120.skinmanager.Core.getNewestVersion(Core.java:171)
me.kitt3120.skinmanager.Core.isUpdateAvailable(Core.java:159)
me.kitt3120.skinmanager.Core.onEnable(Core.java:72)
org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:321)
org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:340)
org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:405)
org.bukkit.craftbukkit.v1_8_R3.CraftServer.loadPlugin(CraftServer.java:357)
org.bukkit.craftbukkit.v1_8_R3.CraftServer.enablePlugins(CraftServer.java:317)
org.bukkit.craftbukkit.v1_8_R3.CraftServer.reload(CraftServer.java:741)
org.bukkit.Bukkit.reload(Bukkit.java:535)
org.bukkit.command.defaults.ReloadCommand.execute(ReloadCommand.java:25)
org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:141)
org.bukkit.craftbukkit.v1_8_R3.CraftServer.dispatchCommand(CraftServer.java:641)
org.bukkit.craftbukkit.v1_8_R3.CraftServer.dispatchServerCommand(CraftServer.java:627)
net.minecraft.server.v1_8_R3.DedicatedServer.aO(DedicatedServer.java:412)
net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:375)
net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:654)
net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:557)
java.lang.Thread.run(Thread.java:813)
Next :

plugins/SkinManager/UpdateInfo.txt (No such file or directory)
java.io.FileNotFoundException: plugins/SkinManager/UpdateInfo.txt (No such file or directory)