Oraxen 1.124.0 Error on startup of server

[00:51:40] [Server thread/ERROR]: Could not load 'plugins\oraxen-1.124.0.jar' in folder 'plugins'
org.bukkit.plugin.InvalidPluginException: Unsupported API version 1.18
    at org.bukkit.craftbukkit.v1_17_R1.util.CraftMagicNumbers.checkSupported(CraftMagicNumbers.java:358) ~[patched_1.17.1.jar:git-Paper-404]
    at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:149) ~[patched_1.17.1.jar:git-Paper-404]
    at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:414) ~[patched_1.17.1.jar:git-Paper-404]
    at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:322) ~[patched_1.17.1.jar:git-Paper-404]
    at org.bukkit.craftbukkit.v1_17_R1.CraftServer.loadPlugins(CraftServer.java:419) ~[patched_1.17.1.jar:git-Paper-404]
    at net.minecraft.server.dedicated.DedicatedServer.initServer(DedicatedServer.java:287) ~[patched_1.17.1.jar:git-Paper-404]
    at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1220) ~[patched_1.17.1.jar:git-Paper-404]
    at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:319) ~[patched_1.17.1.jar:git-Paper-404]
    at java.lang.Thread.run(Thread.java:833) ~[?:?]