Skin-Manager Error

Header :
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:316)
org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:332)
org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:412)
org.bukkit.craftbukkit.v1_7_R4.CraftServer.loadPlugin(CraftServer.java:477)
org.bukkit.craftbukkit.v1_7_R4.CraftServer.enablePlugins(CraftServer.java:395)
net.minecraft.server.v1_7_R4.MinecraftServer.n(MinecraftServer.java:354)
net.minecraft.server.v1_7_R4.MinecraftServer.g(MinecraftServer.java:328)
net.minecraft.server.v1_7_R4.MinecraftServer.a(MinecraftServer.java:284)
net.minecraft.server.v1_7_R4.DedicatedServer.init(DedicatedServer.java:227)
net.minecraft.server.v1_7_R4.MinecraftServer.run(MinecraftServer.java:493)
net.minecraft.server.v1_7_R4.ThreadServerApplication.run(SourceFile:628)
Next :

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