[11:25:56] [Server thread/ERROR]: Error occurred while enabling ShoppingCart v1.2.1 (Is it up to date?)
java.lang.NoSuchMethodError: org.bukkit.configuration.file.YamlConfiguration.loadConfiguration(Ljava/io/InputStream;)Lorg/bukkit/configuration/file/YamlConfiguration;
	at me.limito.bukkit.shopcart.ShoppingCartReloaded.loadYamlAndMerge(ShoppingCartReloaded.scala:141) ~[?:?]
	at me.limito.bukkit.shopcart.ShoppingCartReloaded.loadMessages(ShoppingCartReloaded.scala:62) ~[?:?]
	at me.limito.bukkit.shopcart.ShoppingCartReloaded.reload(ShoppingCartReloaded.scala:50) ~[?:?]
	at me.limito.bukkit.shopcart.ShoppingCartReloaded.onEnable(ShoppingCartReloaded.scala:31) ~[?:?]
	at me.limito.bukkit.shopcart.PluginPreloader.onEnable(PluginPreloader.java:69) ~[?:?]
	at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:264) ~[Spigot.jar:git-Spigot-8cbfc85-ec47e79]
	at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:337) [Spigot.jar:git-Spigot-8cbfc85-ec47e79]
	at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:402) [Spigot.jar:git-Spigot-8cbfc85-ec47e79]
	at org.bukkit.craftbukkit.v1_12_R1.CraftServer.enablePlugin(CraftServer.java:377) [Spigot.jar:git-Spigot-8cbfc85-ec47e79]
	at org.bukkit.craftbukkit.v1_12_R1.CraftServer.enablePlugins(CraftServer.java:327) [Spigot.jar:git-Spigot-8cbfc85-ec47e79]
	at net.minecraft.server.v1_12_R1.MinecraftServer.t(MinecraftServer.java:421) [Spigot.jar:git-Spigot-8cbfc85-ec47e79]
	at net.minecraft.server.v1_12_R1.MinecraftServer.l(MinecraftServer.java:382) [Spigot.jar:git-Spigot-8cbfc85-ec47e79]
	at net.minecraft.server.v1_12_R1.MinecraftServer.a(MinecraftServer.java:337) [Spigot.jar:git-Spigot-8cbfc85-ec47e79]
	at net.minecraft.server.v1_12_R1.DedicatedServer.init(DedicatedServer.java:272) [Spigot.jar:git-Spigot-8cbfc85-ec47e79]
	at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:544) [Spigot.jar:git-Spigot-8cbfc85-ec47e79]
	at java.lang.Thread.run(Unknown Source) [?:1.8.0_121]