[19:19:23 ERROR]: Fatal error trying to convert WGExtender v3.1.1-fork:wgextender/WGExtender.class
java.lang.IllegalArgumentException: Unsupported class file major version 65
        at org.bukkit.craftbukkit.libs.org.objectweb.asm.ClassReader.<init>(ClassReader.java:196) ~[patched_1.16.5.jar:git-Paper-794]
        at org.bukkit.craftbukkit.libs.org.objectweb.asm.ClassReader.<init>(ClassReader.java:177) ~[patched_1.16.5.jar:git-Paper-794]
        at org.bukkit.craftbukkit.libs.org.objectweb.asm.ClassReader.<init>(ClassReader.java:163) ~[patched_1.16.5.jar:git-Paper-794]
        at org.bukkit.craftbukkit.v1_16_R3.util.Commodore.convert(Commodore.java:171) ~[patched_1.16.5.jar:git-Paper-794]
        at org.bukkit.craftbukkit.v1_16_R3.util.CraftMagicNumbers.processClass(CraftMagicNumbers.java:384) ~[patched_1.16.5.jar:git-Paper-794]
        at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:178) ~[patched_1.16.5.jar:git-Paper-794]
        at java.lang.ClassLoader.loadClass(ClassLoader.java:587) ~[?:?]
        at org.bukkit.plugin.java.PluginClassLoader.loadClass0(PluginClassLoader.java:119) ~[patched_1.16.5.jar:git-Paper-794]
        at org.bukkit.plugin.java.PluginClassLoader.loadClass(PluginClassLoader.java:114) ~[patched_1.16.5.jar:git-Paper-794]
        at java.lang.ClassLoader.loadClass(ClassLoader.java:520) ~[?:?]
        at java.lang.Class.forName0(Native Method) ~[?:?]
        at java.lang.Class.forName(Class.java:467) ~[?:?]
        at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:82) ~[patched_1.16.5.jar:git-Paper-794]
        at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:153) ~[patched_1.16.5.jar:git-Paper-794]
        at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:414) ~[patched_1.16.5.jar:git-Paper-794]
        at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:322) ~[patched_1.16.5.jar:git-Paper-794]
        at org.bukkit.craftbukkit.v1_16_R3.CraftServer.loadPlugins(CraftServer.java:393) ~[patched_1.16.5.jar:git-Paper-794]
        at net.minecraft.server.v1_16_R3.DedicatedServer.init(DedicatedServer.java:269) ~[patched_1.16.5.jar:git-Paper-794]
        at net.minecraft.server.v1_16_R3.MinecraftServer.w(MinecraftServer.java:1074) ~[patched_1.16.5.jar:git-Paper-794]
        at net.minecraft.server.v1_16_R3.MinecraftServer.lambda$a$0(MinecraftServer.java:291) ~[patched_1.16.5.jar:git-Paper-794]
        at java.lang.Thread.run(Thread.java:842) [?:?]
[19:19:23 ERROR]: Could not load 'plugins\WGExtender v3.1.1.jar' in folder 'plugins'
org.bukkit.plugin.InvalidPluginException: java.lang.UnsupportedClassVersionError: wgextender/WGExtender has been compiled by a more recent version of the Java Runtime (class file version 65.0), this version of the Java Runtime only recognizes class file versions up to 61.0
        at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:157) ~[patched_1.16.5.jar:git-Paper-794]
        at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:414) ~[patched_1.16.5.jar:git-Paper-794]
        at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:322) ~[patched_1.16.5.jar:git-Paper-794]
        at org.bukkit.craftbukkit.v1_16_R3.CraftServer.loadPlugins(CraftServer.java:393) ~[patched_1.16.5.jar:git-Paper-794]
        at net.minecraft.server.v1_16_R3.DedicatedServer.init(DedicatedServer.java:269) ~[patched_1.16.5.jar:git-Paper-794]
        at net.minecraft.server.v1_16_R3.MinecraftServer.w(MinecraftServer.java:1074) ~[patched_1.16.5.jar:git-Paper-794]
        at net.minecraft.server.v1_16_R3.MinecraftServer.lambda$a$0(MinecraftServer.java:291) ~[patched_1.16.5.jar:git-Paper-794]
        at java.lang.Thread.run(Thread.java:842) [?:?]
Caused by: java.lang.UnsupportedClassVersionError: wgextender/WGExtender has been compiled by a more recent version of the Java Runtime (class file version 65.0), this version of the Java Runtime only recognizes class file versions up to 61.0
        at java.lang.ClassLoader.defineClass1(Native Method) ~[?:?]
        at java.lang.ClassLoader.defineClass(ClassLoader.java:1012) ~[?:?]
        at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:150) ~[?:?]
        at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:201) ~[patched_1.16.5.jar:git-Paper-794]
        at java.lang.ClassLoader.loadClass(ClassLoader.java:587) ~[?:?]
        at org.bukkit.plugin.java.PluginClassLoader.loadClass0(PluginClassLoader.java:119) ~[patched_1.16.5.jar:git-Paper-794]
        at org.bukkit.plugin.java.PluginClassLoader.loadClass(PluginClassLoader.java:114) ~[patched_1.16.5.jar:git-Paper-794]
        at java.lang.ClassLoader.loadClass(ClassLoader.java:520) ~[?:?]
        at java.lang.Class.forName0(Native Method) ~[?:?]
        at java.lang.Class.forName(Class.java:467) ~[?:?]
        at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:82) ~[patched_1.16.5.jar:git-Paper-794]
        at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:153) ~[patched_1.16.5.jar:git-Paper-794]
        ... 7 more