I just tried to load this plugin into my "Plugins" folder of my server, but my console gave the error: Could not load 'plugins/lootr-1.16.4-0.0.5.17(1).jar' in folder 'plugins', followed by:
org.bukkit.plugin.InvalidDescriptionException: Invalid plugin.yml at org.bukkit.plugin.java.JavaPluginLoader.getPluginDescription(JavaPluginLoader.java:162) ~[patched_1.16.5.jar:git-Paper-655] at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:148) ~[patched_1.16.5.jar:git-Paper-655] at org.bukkit.craftbukkit.v1_16_R3.CraftServer.loadPlugins(CraftServer.java:389) ~[patched_1.16.5.jar:git-Paper-655] at net.minecraft.server.v1_16_R3.DedicatedServer.init(DedicatedServer.java:252) ~[patched_1.16.5.jar:git-Paper-655] at net.minecraft.server.v1_16_R3.MinecraftServer.w(MinecraftServer.java:1065) ~[patched_1.16.5.jar:git-Paper-655] at net.minecraft.server.v1_16_R3.MinecraftServer.lambda$a$0(MinecraftServer.java:289) ~[patched_1.16.5.jar:git-Paper-655] at java.lang.Thread.run(Thread.java:748) [?:1.8.0_282] Caused by: java.io.FileNotFoundException: Jar does not contain plugin.yml ... 7 more

Did I install the plugin incorrectly? What do I need to do?