mineduino error

[18:21:19] [Server thread/ERROR]: Could not load 'plugins\mineduino.jar' in folder 'plugins'
org.bukkit.plugin.InvalidPluginException: Cannot find main class `eu.razniewski.mineduino.MineduinoPlugin'
	at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:81) ~[patched_1.16.5.jar:git-Paper-613]
	at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:137) ~[patched_1.16.5.jar:git-Paper-613]
	at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:397) ~[patched_1.16.5.jar:git-Paper-613]
	at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:305) ~[patched_1.16.5.jar:git-Paper-613]
	at org.bukkit.craftbukkit.v1_16_R3.CraftServer.loadPlugins(CraftServer.java:389) ~[patched_1.16.5.jar:git-Paper-613]
	at net.minecraft.server.v1_16_R3.DedicatedServer.init(DedicatedServer.java:251) ~[patched_1.16.5.jar:git-Paper-613]
	at net.minecraft.server.v1_16_R3.MinecraftServer.w(MinecraftServer.java:1065) ~[patched_1.16.5.jar:git-Paper-613]
	at net.minecraft.server.v1_16_R3.MinecraftServer.lambda$a$0(MinecraftServer.java:289) ~[patched_1.16.5.jar:git-Paper-613]
	at java.lang.Thread.run(Thread.java:834) [?:?]
Caused by: java.lang.ClassNotFoundException: eu.razniewski.mineduino.MineduinoPlugin
	at java.net.URLClassLoader.findClass(URLClassLoader.java:471) ~[?:?]
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:182) ~[patched_1.16.5.jar:git-Paper-613]
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:111) ~[patched_1.16.5.jar:git-Paper-613]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:589) ~[?:?]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:522) ~[?:?]
	at java.lang.Class.forName0(Native Method) ~[?:?]
	at java.lang.Class.forName(Class.java:398) ~[?:?]
	at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:79) ~[patched_1.16.5.jar:git-Paper-613]
	... 8 more