Cartographer[1.8.x-1.12.x]

Not working ...

[13:19:39] [Server thread/ERROR]: Could not load 'plugins\Cartographer-8.1.jar' in folder 'plugins'
org.bukkit.plugin.InvalidPluginException: java.lang.ClassFormatError: Duplicate method name&signature in class file io/github/bananapuncher714/cartographer/CartographerMain
at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:133) ~[spigot-1.12.jar:git-Spigot-596221b-9a1fc1e]
at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:326) ~[spigot-1.12.jar:git-Spigot-596221b-9a1fc1e]
at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:248) [spigot-1.12.jar:git-Spigot-596221b-9a1fc1e]
at org.bukkit.craftbukkit.v1_12_R1.CraftServer.loadPlugins(CraftServer.java:298) [spigot-1.12.jar:git-Spigot-596221b-9a1fc1e]
at net.minecraft.server.v1_12_R1.DedicatedServer.init(DedicatedServer.java:205) [spigot-1.12.jar:git-Spigot-596221b-9a1fc1e]
at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:544) [spigot-1.12.jar:git-Spigot-596221b-9a1fc1e]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_151]
Caused by: java.lang.ClassFormatError: Duplicate method name&signature in class file io/github/bananapuncher714/cartographer/CartographerMain
at java.lang.ClassLoader.defineClass1(Native Method) ~[?:1.8.0_151]
at java.lang.ClassLoader.defineClass(Unknown Source) ~[?:1.8.0_151]
at java.security.SecureClassLoader.defineClass(Unknown Source) ~[?:1.8.0_151]
at java.net.URLClassLoader.defineClass(Unknown Source) ~[?:1.8.0_151]
at java.net.URLClassLoader.access$100(Unknown Source) ~[?:1.8.0_151]
at java.net.URLClassLoader$1.run(Unknown Source) ~[?:1.8.0_151]
at java.net.URLClassLoader$1.run(Unknown Source) ~[?:1.8.0_151]
at java.security.AccessController.doPrivileged(Native Method) ~[?:1.8.0_151]
at java.net.URLClassLoader.findClass(Unknown Source) ~[?:1.8.0_151]
at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:101) ~[spigot-1.12.jar:git-Spigot-596221b-9a1fc1e]
at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:86) ~[spigot-1.12.jar:git-Spigot-596221b-9a1fc1e]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_151]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_151]
at java.lang.Class.forName0(Native Method) ~[?:1.8.0_151]
at java.lang.Class.forName(Unknown Source) ~[?:1.8.0_151]
at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:64) ~[spigot-1.12.jar:git-Spigot-596221b-9a1fc1e]
at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:129) ~[spigot-1.12.jar:git-Spigot-596221b-9a1fc1e]
... 6 more