[SEVERE] Error occurred while enabling AutoSaveWorld v3.8 (Is it up to date?)
java.lang.NoClassDefFoundError: java/nio/file/Files
    at autosave.AutoSave.onEnable(AutoSave.java:143)
    at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:217)
    at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:374)
    at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:381)
    at org.bukkit.craftbukkit.CraftServer.loadPlugin(CraftServer.java:270)
    at org.bukkit.craftbukkit.CraftServer.enablePlugins(CraftServer.java:252)
    at net.minecraft.server.MinecraftServer.i(MinecraftServer.java:298)
    at net.minecraft.server.MinecraftServer.d(MinecraftServer.java:277)
    at net.minecraft.server.MinecraftServer.a(MinecraftServer.java:227)
    at net.minecraft.server.DedicatedServer.init(DedicatedServer.java:140)
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:378)
    at net.minecraft.server.ThreadServerApplication.run(SourceFile:539)
Caused by: java.lang.ClassNotFoundException: java.nio.file.Files
    at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
    at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:44)
    at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:29)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:321)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
    ... 12 more