[16:57:58 ERROR]: Could not load 'plugins\GUI.jar' in folder 'plugins'
org.bukkit.plugin.InvalidPluginException: java.lang.UnsupportedClassVersionError: com/adriftbuffalo/chatcontrol/Main has been compiled by a more recent version of the Java Runtime (class file version 53.0), this version of the Java Runtime only recognizes class file versions up to 52.0
        at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:136) ~[server.jar:git-Spigot-518206a-a5b9c7b]
        at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:327) ~[server.jar:git-Spigot-518206a-a5b9c7b]
        at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:248) [server.jar:git-Spigot-518206a-a5b9c7b]
        at org.bukkit.craftbukkit.v1_13_R2.CraftServer.loadPlugins(CraftServer.java:323) [server.jar:git-Spigot-518206a-a5b9c7b]
        at org.bukkit.craftbukkit.v1_13_R2.CraftServer.reload(CraftServer.java:805) [server.jar:git-Spigot-518206a-a5b9c7b]
        at org.bukkit.Bukkit.reload(Bukkit.java:570) [server.jar:git-Spigot-518206a-a5b9c7b]
        at org.bukkit.command.defaults.ReloadCommand.execute(ReloadCommand.java:27) [server.jar:git-Spigot-518206a-a5b9c7b]
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:139) [server.jar:git-Spigot-518206a-a5b9c7b]
        at org.bukkit.craftbukkit.v1_13_R2.CraftServer.dispatchCommand(CraftServer.java:702) [server.jar:git-Spigot-518206a-a5b9c7b]
        at org.bukkit.craftbukkit.v1_13_R2.CraftServer.dispatchServerCommand(CraftServer.java:687) [server.jar:git-Spigot-518206a-a5b9c7b]
        at net.minecraft.server.v1_13_R2.DedicatedServer.handleCommandQueue(DedicatedServer.java:459) [server.jar:git-Spigot-518206a-a5b9c7b]
        at net.minecraft.server.v1_13_R2.DedicatedServer.b(DedicatedServer.java:418) [server.jar:git-Spigot-518206a-a5b9c7b]
        at net.minecraft.server.v1_13_R2.MinecraftServer.a(MinecraftServer.java:830) [server.jar:git-Spigot-518206a-a5b9c7b]
        at net.minecraft.server.v1_13_R2.MinecraftServer.run(MinecraftServer.java:728) [server.jar:git-Spigot-518206a-a5b9c7b]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_201]
Caused by: java.lang.UnsupportedClassVersionError: com/adriftbuffalo/chatcontrol/Main has been compiled by a more recent version of the Java Runtime (class file version 53.0), this version of the Java Runtime only recognizes class file versions up to 52.0
        at java.lang.ClassLoader.defineClass1(Native Method) ~[?:1.8.0_201]
        at java.lang.ClassLoader.defineClass(Unknown Source) ~[?:1.8.0_201]
        at java.security.SecureClassLoader.defineClass(Unknown Source) ~[?:1.8.0_201]
        at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:130) ~[server.jar:git-Spigot-518206a-a5b9c7b]
        at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:80) ~[server.jar:git-Spigot-518206a-a5b9c7b]
        at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_201]
        at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_201]
        at java.lang.Class.forName0(Native Method) ~[?:1.8.0_201]
        at java.lang.Class.forName(Unknown Source) ~[?:1.8.0_201]
        at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:58) ~[server.jar:git-Spigot-518206a-a5b9c7b]
        at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:132) ~[server.jar:git-Spigot-518206a-a5b9c7b]
        ... 14 more