Skin-Manager Error

Header :
java.io.FileInputStream.open0(Native Method)
java.io.FileInputStream.open(Unknown Source)
java.io.FileInputStream.<init>(Unknown Source)
java.util.Scanner.<init>(Unknown Source)
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:335)
org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:405)
org.bukkit.craftbukkit.v1_8_R2.CraftServer.loadPlugin(CraftServer.java:356)
org.bukkit.craftbukkit.v1_8_R2.CraftServer.enablePlugins(CraftServer.java:316)
net.minecraft.server.v1_8_R2.MinecraftServer.r(MinecraftServer.java:416)
net.minecraft.server.v1_8_R2.MinecraftServer.k(MinecraftServer.java:382)
net.minecraft.server.v1_8_R2.MinecraftServer.a(MinecraftServer.java:337)
net.minecraft.server.v1_8_R2.DedicatedServer.init(DedicatedServer.java:257)
net.minecraft.server.v1_8_R2.MinecraftServer.run(MinecraftServer.java:522)
java.lang.Thread.run(Unknown Source)
Next :

plugins\SkinManager\UpdateInfo.txt (The system cannot find the file specified)
java.io.FileNotFoundException: plugins\SkinManager\UpdateInfo.txt (The system cannot find the file specified)