[ERROR] Could not pass event PlayerLoginEvent to AltFinder v1.0

org.bukkit.event.EventException: null

at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:298) ~[craftbukkit-1.12.2.jar:git-Bukkit-2b93d83]

at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[craftbukkit-1.12.2.jar:git-Bukkit-2b93d83]

at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:499) [craftbukkit-1.12.2.jar:git-Bukkit-2b93d83]

at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:484) [craftbukkit-1.12.2.jar:git-Bukkit-2b93d83]

at net.minecraft.server.v1_12_R1.PlayerList.attemptLogin(PlayerList.java:514) [craftbukkit-1.12.2.jar:git-Bukkit-2b93d83]

at net.minecraft.server.v1_12_R1.LoginListener.b(LoginListener.java:105) [craftbukkit-1.12.2.jar:git-Bukkit-2b93d83]

at net.minecraft.server.v1_12_R1.LoginListener.e(LoginListener.java:57) [craftbukkit-1.12.2.jar:git-Bukkit-2b93d83]

at net.minecraft.server.v1_12_R1.NetworkManager.a(NetworkManager.java:224) [craftbukkit-1.12.2.jar:git-Bukkit-2b93d83]

at net.minecraft.server.v1_12_R1.ServerConnection.c(SourceFile:187) [craftbukkit-1.12.2.jar:git-Bukkit-2b93d83]

at net.minecraft.server.v1_12_R1.MinecraftServer.D(MinecraftServer.java:768) [craftbukkit-1.12.2.jar:git-Bukkit-2b93d83]

at net.minecraft.server.v1_12_R1.DedicatedServer.D(DedicatedServer.java:371) [craftbukkit-1.12.2.jar:git-Bukkit-2b93d83]

at net.minecraft.server.v1_12_R1.MinecraftServer.C(MinecraftServer.java:651) [craftbukkit-1.12.2.jar:git-Bukkit-2b93d83]

at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:555) [craftbukkit-1.12.2.jar:git-Bukkit-2b93d83]

at java.lang.Thread.run(Thread.java:813) [?:1.8.0_212]

Caused by: java.lang.ClassCastException: org.bukkit.configuration.MemorySection incompatible with [Ljava.lang.String;

at dev.glister.altfinder.Events.loadHashMap(Events.java:50) ~[?:?]

at dev.glister.altfinder.Events.onLogin(Events.java:39) ~[?:?]

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_212]

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_212]

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_212]

at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_212]

at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:296) ~[craftbukkit-1.12.2.jar:git-Bukkit-2b93d83]

... 13 more