Plugin throwing version error on startup?

Shrimp :

I have been trying to diagnose this problem for hours now, and I just can't figure it out. I'm ripping my hair out trying to get this to work, please help. I'm using intellij btw.

I have updated spigot, reinstalled my entire server, tried bukkit, reinstalled intellij, reinstalled my jre, and reinstalled my jdk, and none of it did anything. Please, for the love of God, someone help me.

[12:26:23 ERROR]: Could not load 'plugins\Test.jar' in folder 'plugins'
org.bukkit.plugin.InvalidPluginException: java.lang.UnsupportedClassVersionError: me/shrimp/test/Core 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:139) ~[spigot-1.15.2.jar:git-Spigot-a03b1fd-bbe3d58]
    at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:394) ~[spigot-1.15.2.jar:git-Spigot-a03b1fd-bbe3d58]
    at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:301) [spigot-1.15.2.jar:git-Spigot-a03b1fd-bbe3d58]
    at org.bukkit.craftbukkit.v1_15_R1.CraftServer.loadPlugins(CraftServer.java:353) [spigot-1.15.2.jar:git-Spigot-a03b1fd-bbe3d58]
    at net.minecraft.server.v1_15_R1.DedicatedServer.init(DedicatedServer.java:210) [spigot-1.15.2.jar:git-Spigot-a03b1fd-bbe3d58]
    at net.minecraft.server.v1_15_R1.MinecraftServer.run(MinecraftServer.java:784) [spigot-1.15.2.jar:git-Spigot-a03b1fd-bbe3d58]
    at java.lang.Thread.run(Unknown Source) [?:1.8.0_241]
Caused by: java.lang.UnsupportedClassVersionError: me/shrimp/test/Core 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_241]
    at java.lang.ClassLoader.defineClass(Unknown Source) ~[?:1.8.0_241]
    at java.security.SecureClassLoader.defineClass(Unknown Source) ~[?:1.8.0_241]
    at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:163) ~[spigot-1.15.2.jar:git-Spigot-a03b1fd-bbe3d58]
    at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:96) ~[spigot-1.15.2.jar:git-Spigot-a03b1fd-bbe3d58]
    at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_241]
    at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_241]
    at java.lang.Class.forName0(Native Method) ~[?:1.8.0_241]
    at java.lang.Class.forName(Unknown Source) ~[?:1.8.0_241]
    at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:64) ~[spigot-1.15.2.jar:git-Spigot-a03b1fd-bbe3d58]
    at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:135) ~[spigot-1.15.2.jar:git-Spigot-a03b1fd-bbe3d58]
    ... 6 more

Jason :

It looks to me like the plugin was compiled with a version of java that is greater than what you're using to run the plugin. Either downgrade your plugins java target version used to to compile to match your server or upgrade your server to match your plugins java target version used to compile.

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