MMOcore error

[00:04:58 ERROR]: Could not load 'plugins\MMOItems-6.0.jar' in folder 'plugins'
org.bukkit.plugin.UnknownDependencyException: Unknown dependency MMOLib. Please download and install MMOLib to run this plugin.
        at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:272) ~[patched_1.16.5.jar:git-Paper-629]
        at org.bukkit.craftbukkit.v1_16_R3.CraftServer.loadPlugins(CraftServer.java:389) ~[patched_1.16.5.jar:git-Paper-629]
        at net.minecraft.server.v1_16_R3.DedicatedServer.init(DedicatedServer.java:252) ~[patched_1.16.5.jar:git-Paper-629]
        at net.minecraft.server.v1_16_R3.MinecraftServer.w(MinecraftServer.java:1065) ~[patched_1.16.5.jar:git-Paper-629]
        at net.minecraft.server.v1_16_R3.MinecraftServer.lambda$a$0(MinecraftServer.java:289) ~[patched_1.16.5.jar:git-Paper-629]
        at java.lang.Thread.run(Thread.java:834) [?:?]