Unable to load, error

[areny7]

The plugin cannot be loaded correctly in the 1.16 paper environment

[02:16:20] [Server thread/ERROR]: Could not load 'plugins\CatchBall-1.1.4.jar' in folder 'plugins'
org.bukkit.plugin.InvalidPluginException: java.lang.UnsupportedClassVersionError: com/github/nutt1101/CatchBall 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_1.16.5.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:831) [?:?]

[NUTT1101]

Thank you for your reporting!
I have fixed this bug on v.1.1.5.

Description:
My compiled version of java is java-17,because Minecraft version 1.17~1.19 only supports java-17 or above,but 1.16 only supports java-16,so when you use java-16 to load this plugin, it crashes.

According your report:

[02:16:20] [Server thread/ERROR]: Could not load 'plugins\CatchBall-1.1.4.jar' in folder 'plugins'
org.bukkit.plugin.InvalidPluginException: java.lang.UnsupportedClassVersionError: com/github/nutt1101/CatchBall 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

https://javaalmanac.io/bytecode/versions/