java errors

[06:51:56] [Server thread/ERROR]: Could not load 'plugins/InfinitySlots 0.31.jar' in folder 'plugins'
org.bukkit.plugin.InvalidPluginException: java.lang.UnsupportedClassVersionError: me/dontactlikeme/InfinitySlots/Main has been compiled by a more recent version of the Java Runtime (class file version 56.0), this version of the Java Runtime only recognizes class file versions up to 52.0
	at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:138) ~[patched_1.15.2.jar:git-Paper-76]
	at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:337) ~[patched_1.15.2.jar:git-Paper-76]
	at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:257) ~[patched_1.15.2.jar:git-Paper-76]
	at org.bukkit.craftbukkit.v1_15_R1.CraftServer.loadPlugins(CraftServer.java:356) ~[patched_1.15.2.jar:git-Paper-76]
	at net.minecraft.server.v1_15_R1.DedicatedServer.init(DedicatedServer.java:227) ~[patched_1.15.2.jar:git-Paper-76]
	at net.minecraft.server.v1_15_R1.MinecraftServer.run(MinecraftServer.java:885) ~[patched_1.15.2.jar:git-Paper-76]
	at java.lang.Thread.run(Thread.java:748) [?:1.8.0_222]
Caused by: java.lang.UnsupportedClassVersionError: me/dontactlikeme/InfinitySlots/Main has been compiled by a more recent version of the Java Runtime (class file version 56.0), 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_222]
	at java.lang.ClassLoader.defineClass(ClassLoader.java:763) ~[?:1.8.0_222]
	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) ~[?:1.8.0_222]
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:146) ~[patched_1.15.2.jar:git-Paper-76]
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:96) ~[patched_1.15.2.jar:git-Paper-76]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:1.8.0_222]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_222]
	at java.lang.Class.forName0(Native Method) ~[?:1.8.0_222]
	at java.lang.Class.forName(Class.java:348) ~[?:1.8.0_222]
	at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:64) ~[patched_1.15.2.jar:git-Paper-76]
	at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:134) ~[patched_1.15.2.jar:git-Paper-76]
	... 6 more