[Server thread/ERROR]: Could not load 'plugins/DeluxeMenus-1.13.4-Release.jar' in folder 'plugins'
org.bukkit.plugin.InvalidPluginException: java.lang.UnsupportedClassVersionError: JVMCFRE003 bad major version; class=com/extendedclip/deluxemenus/DeluxeMenus, offset=6
	at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:131) ~[patched_1.12.2.jar:git-Paper-1620]
	at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:329) ~[patched_1.12.2.jar:git-Paper-1620]
	at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:251) ~[patched_1.12.2.jar:git-Paper-1620]
	at org.bukkit.craftbukkit.v1_12_R1.CraftServer.loadPlugins(CraftServer.java:318) ~[patched_1.12.2.jar:git-Paper-1620]
	at net.minecraft.server.v1_12_R1.DedicatedServer.init(DedicatedServer.java:222) ~[patched_1.12.2.jar:git-Paper-1620]
	at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:616) ~[patched_1.12.2.jar:git-Paper-1620]
	at java.lang.Thread.run(Thread.java:826) [?:1.8.0_312]
Caused by: java.lang.UnsupportedClassVersionError: JVMCFRE003 bad major version; class=com/extendedclip/deluxemenus/DeluxeMenus, offset=6
	at java.lang.ClassLoader.defineClassImpl(Native Method) ~[?:1.8.0_312]
	at java.lang.ClassLoader.defineClassInternal(ClassLoader.java:397) ~[?:1.8.0_312]
	at java.lang.ClassLoader.defineClass(ClassLoader.java:358) ~[?:1.8.0_312]
	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) ~[?:1.8.0_312]
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:152) ~[patched_1.12.2.jar:git-Paper-1620]
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:104) ~[patched_1.12.2.jar:git-Paper-1620]
	at java.lang.ClassLoader.loadClassHelper(ClassLoader.java:954) ~[?:1.8.0_312]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:899) ~[?:1.8.0_312]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:882) ~[?:1.8.0_312]
	at java.lang.Class.forNameImpl(Native Method) ~[?:1.8.0_312]
	at java.lang.Class.forName(Class.java:404) ~[?:1.8.0_312]
	at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:82) ~[patched_1.12.2.jar:git-Paper-1620]
	at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:127) ~[patched_1.12.2.jar:git-Paper-1620]
	... 6 more