Can you please help me fixing this error?
For which Java-Version is this Plugin?
And is it Compatible with Spigot 1.8.8 or 1.12.2?
Everytime when i start my Server with this plugin this error pops up
[19:02:09] [Server thread/ERROR]: Could not load 'plugins\MatchMe (2).jar' in folder 'plugins'
org.bukkit.plugin.InvalidPluginException: java.lang.UnsupportedClassVersionError: za/botneil/bungeecore/Spigot has been compiled by a more recent version of the Java Runtime (class file version 55.0), this version of the Java Runtime only recognizes class file versions up to 52.0
at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:135) ~[spigot.jar:git-Spigot-db6de12-18fbb24]
at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:329) ~[spigot.jar:git-Spigot-db6de12-18fbb24]
at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:251) [spigot.jar:git-Spigot-db6de12-18fbb24]
at org.bukkit.craftbukkit.v1_8_R3.CraftServer.loadPlugins(CraftServer.java:292) [spigot.jar:git-Spigot-db6de12-18fbb24]
at net.minecraft.server.v1_8_R3.DedicatedServer.init(DedicatedServer.java:198) [spigot.jar:git-Spigot-db6de12-18fbb24]
at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:525) [spigot.jar:git-Spigot-db6de12-18fbb24]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_271]
Caused by: java.lang.UnsupportedClassVersionError: za/botneil/bungeecore/Spigot has been compiled by a more recent version of the Java Runtime (class file version 55.0), 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_271]
at java.lang.ClassLoader.defineClass(Unknown Source) ~[?:1.8.0_271]
at java.security.SecureClassLoader.defineClass(Unknown Source) ~[?:1.8.0_271]
at java.net.URLClassLoader.defineClass(Unknown Source) ~[?:1.8.0_271]
at java.net.URLClassLoader.access$100(Unknown Source) ~[?:1.8.0_271]
at java.net.URLClassLoader$1.run(Unknown Source) ~[?:1.8.0_271]
at java.net.URLClassLoader$1.run(Unknown Source) ~[?:1.8.0_271]
at java.security.AccessController.doPrivileged(Native Method) ~[?:1.8.0_271]
at java.net.URLClassLoader.findClass(Unknown Source) ~[?:1.8.0_271]
at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:101) ~[spigot.jar:git-Spigot-db6de12-18fbb24]
at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:86) ~[spigot.jar:git-Spigot-db6de12-18fbb24]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_271]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_271]
at java.lang.Class.forName0(Native Method) ~[?:1.8.0_271]
at java.lang.Class.forName(Unknown Source) ~[?:1.8.0_271]
at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:64) ~[spigot.jar:git-Spigot-db6de12-18fbb24]
at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:131) ~[spigot.jar:git-Spigot-db6de12-18fbb24]
... 6 more
[19:02:09] [Server thread/ERROR]: Could not load 'plugins\IWSorter.jar' in folder 'plugins'
org.bukkit.plugin.InvalidPluginException: java.lang.NoClassDefFoundError: net/md_5/bungee/api/plugin/Listener
at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:135) ~[spigot.jar:git-Spigot-db6de12-18fbb24]
at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:329) ~[spigot.jar:git-Spigot-db6de12-18fbb24]
at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:251) [spigot.jar:git-Spigot-db6de12-18fbb24]
at org.bukkit.craftbukkit.v1_8_R3.CraftServer.loadPlugins(CraftServer.java:292) [spigot.jar:git-Spigot-db6de12-18fbb24]
at net.minecraft.server.v1_8_R3.DedicatedServer.init(DedicatedServer.java:198) [spigot.jar:git-Spigot-db6de12-18fbb24]
at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:525) [spigot.jar:git-Spigot-db6de12-18fbb24]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_271]
Caused by: java.lang.NoClassDefFoundError: net/md_5/bungee/api/plugin/Listener
at java.lang.ClassLoader.defineClass1(Native Method) ~[?:1.8.0_271]
at java.lang.ClassLoader.defineClass(Unknown Source) ~[?:1.8.0_271]
at java.security.SecureClassLoader.defineClass(Unknown Source) ~[?:1.8.0_271]
at java.net.URLClassLoader.defineClass(Unknown Source) ~[?:1.8.0_271]
at java.net.URLClassLoader.access$100(Unknown Source) ~[?:1.8.0_271]
at java.net.URLClassLoader$1.run(Unknown Source) ~[?:1.8.0_271]
at java.net.URLClassLoader$1.run(Unknown Source) ~[?:1.8.0_271]
at java.security.AccessController.doPrivileged(Native Method) ~[?:1.8.0_271]
at java.net.URLClassLoader.findClass(Unknown Source) ~[?:1.8.0_271]
at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:101) ~[spigot.jar:git-Spigot-db6de12-18fbb24]
at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:86) ~[spigot.jar:git-Spigot-db6de12-18fbb24]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_271]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_271]
at java.lang.Class.forName0(Native Method) ~[?:1.8.0_271]
at java.lang.Class.forName(Unknown Source) ~[?:1.8.0_271]
at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:64) ~[spigot.jar:git-Spigot-db6de12-18fbb24]
at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:131) ~[spigot.jar:git-Spigot-db6de12-18fbb24]
... 6 more
Caused by: java.lang.ClassNotFoundException: net.md_5.bungee.api.plugin.Listener
at java.net.URLClassLoader.findClass(Unknown Source) ~[?:1.8.0_271]
at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:101) ~[spigot.jar:git-Spigot-db6de12-18fbb24]
at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:86) ~[spigot.jar:git-Spigot-db6de12-18fbb24]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_271]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_271]
at java.lang.ClassLoader.defineClass1(Native Method) ~[?:1.8.0_271]
at java.lang.ClassLoader.defineClass(Unknown Source) ~[?:1.8.0_271]
at java.security.SecureClassLoader.defineClass(Unknown Source) ~[?:1.8.0_271]
at java.net.URLClassLoader.defineClass(Unknown Source) ~[?:1.8.0_271]
at java.net.URLClassLoader.access$100(Unknown Source) ~[?:1.8.0_271]
at java.net.URLClassLoader$1.run(Unknown Source) ~[?:1.8.0_271]
at java.net.URLClassLoader$1.run(Unknown Source) ~[?:1.8.0_271]
at java.security.AccessController.doPrivileged(Native Method) ~[?:1.8.0_271]
at java.net.URLClassLoader.findClass(Unknown Source) ~[?:1.8.0_271]
at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:101) ~[spigot.jar:git-Spigot-db6de12-18fbb24]
at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:86) ~[spigot.jar:git-Spigot-db6de12-18fbb24]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_271]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_271]
at java.lang.Class.forName0(Native Method) ~[?:1.8.0_271]
at java.lang.Class.forName(Unknown Source) ~[?:1.8.0_271]
at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:64) ~[spigot.jar:git-Spigot-db6de12-18fbb24]
at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:131) ~[spigot.jar:git-Spigot-db6de12-18fbb24]
... 6 more

Great plugin dude, you're a great developer! (ExtraExtraExtraExtraExtraExtraExtra)

Okay. I have bough one pretty same plugin as this. But this is awesome and free! Keep up. Good Work! :)

Very good plugin and developer, hope to continue to
update