Error

[18:36:54 ERROR]: Could not load 'plugins\DeathMessages.jar' in folder 'plugins'
org.bukkit.plugin.InvalidPluginException: java.lang.UnsupportedClassVersionError: dev/mrshawn/deathmessages/DeathMessages has been compiled by a more recent version of the Java Runtime (class file version 61.0), this version of the Java Runtime only recognizes class file versions up to 60.0
        at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:157) ~[patched_1.17.1.jar:git-Purpur-1428]
        at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:414) ~[patched_1.17.1.jar:git-Purpur-1428]
        at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:322) ~[patched_1.17.1.jar:git-Purpur-1428]
        at org.bukkit.craftbukkit.v1_17_R1.CraftServer.loadPlugins(CraftServer.java:419) ~[patched_1.17.1.jar:git-Purpur-1428]
        at net.minecraft.server.dedicated.DedicatedServer.initServer(DedicatedServer.java:322) ~[patched_1.17.1.jar:git-Purpur-1428]
        at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1233) ~[patched_1.17.1.jar:git-Purpur-1428]
        at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:322) ~[patched_1.17.1.jar:git-Purpur-1428]
        at java.lang.Thread.run(Thread.java:831) ~[?:?]
Caused by: java.lang.UnsupportedClassVersionError: dev/mrshawn/deathmessages/DeathMessages has been compiled by a more recent version of the Java Runtime (class file version 61.0), this version of the Java Runtime only recognizes class file versions up to 60.0
        at java.lang.ClassLoader.defineClass1(Native Method) ~[?:?]
        at java.lang.ClassLoader.defineClass(ClassLoader.java:1010) ~[?:?]
        at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:150) ~[?:?]
        at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:200) ~[patched_1.17.1.jar:git-Purpur-1428]
        at java.lang.ClassLoader.loadClass(ClassLoader.java:586) ~[?:?]
        at org.bukkit.plugin.java.PluginClassLoader.loadClass0(PluginClassLoader.java:110) ~[patched_1.17.1.jar:git-Purpur-1428]
        at org.bukkit.plugin.java.PluginClassLoader.loadClass(PluginClassLoader.java:105) ~[patched_1.17.1.jar:git-Purpur-1428]
        at java.lang.ClassLoader.loadClass(ClassLoader.java:519) ~[?:?]
        at java.lang.Class.forName0(Native Method) ~[?:?]
        at java.lang.Class.forName(Class.java:466) ~[?:?]
        at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:73) ~[patched_1.17.1.jar:git-Purpur-1428]
        at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:153) ~[patched_1.17.1.jar:git-Purpur-1428]
        ... 7 more