Kits v2.1 error log 1.12.2

java.lang.NoSuchMethodError: org.bukkit.configuration.file.YamlConfiguration.load(Ljava/io/InputStream;)V
        at com.dragonphase.kits.configuration.Config.copyDefaults(Config.java:46) ~[?:?]
        at com.dragonphase.kits.Kits.registerConfig(Kits.java:52) ~[?:?]
        at com.dragonphase.kits.Kits.onEnable(Kits.java:37) ~[?:?]
        at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:264) ~[spigot.jar:git-Spigot-109b080-ab09b27]
        at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:337) [spigot.jar:git-Spigot-109b080-ab09b27]
        at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:403) [spigot.jar:git-Spigot-109b080-ab09b27]
        at org.bukkit.craftbukkit.v1_12_R1.CraftServer.enablePlugin(CraftServer.java:381) [spigot.jar:git-Spigot-109b080-ab09b27]
        at org.bukkit.craftbukkit.v1_12_R1.CraftServer.enablePlugins(CraftServer.java:330) [spigot.jar:git-Spigot-109b080-ab09b27]
        at org.bukkit.craftbukkit.v1_12_R1.CraftServer.reload(CraftServer.java:752) [spigot.jar:git-Spigot-109b080-ab09b27]
        at org.bukkit.Bukkit.reload(Bukkit.java:525) [spigot.jar:git-Spigot-109b080-ab09b27]
        at org.bukkit.command.defaults.ReloadCommand.execute(ReloadCommand.java:27) [spigot.jar:git-Spigot-109b080-ab09b27]
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:141) [spigot.jar:git-Spigot-109b080-ab09b27]
        at org.bukkit.craftbukkit.v1_12_R1.CraftServer.dispatchCommand(CraftServer.java:648) [spigot.jar:git-Spigot-109b080-ab09b27]
        at org.bukkit.craftbukkit.v1_12_R1.CraftServer.dispatchServerCommand(CraftServer.java:634) [spigot.jar:git-Spigot-109b080-ab09b27]
        at net.minecraft.server.v1_12_R1.DedicatedServer.aP(DedicatedServer.java:444) [spigot.jar:git-Spigot-109b080-ab09b27]
        at net.minecraft.server.v1_12_R1.DedicatedServer.D(DedicatedServer.java:407) [spigot.jar:git-Spigot-109b080-ab09b27]
        at net.minecraft.server.v1_12_R1.MinecraftServer.C(MinecraftServer.java:679) [spigot.jar:git-Spigot-109b080-ab09b27]
        at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:577) [spigot.jar:git-Spigot-109b080-ab09b27]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_151]