[Server thread/ERROR] [Sponge]: Error occurred while executing command 'n create fisherland' for source EntityPlayerMP['Sgt_Stubby'/22, l='world', x=179,26, y=64,00, z=-205,89]: org.spongepowered.api.service.economy.EconomyService.getOrCreateAccount(Ljava/util/UUID;)Ljava/util/Optional;
java.lang.NoSuchMethodError: org.spongepowered.api.service.economy.EconomyService.getOrCreateAccount(Ljava/util/UUID;)Ljava/util/Optional;
        at com.arckenver.nations.cmdexecutor.NationCreateExecutor.execute(NationCreateExecutor.java:79) ~[NationCreateExecutor.class:0.1]
        at org.spongepowered.api.command.args.ChildCommandElementExecutor.execute(ChildCommandElementExecutor.java:177) ~[ChildCommandElementExecutor.class:1.8-1577-4.0.0-BETA-1032]
        at org.spongepowered.api.command.spec.CommandSpec.process(CommandSpec.java:332) ~[CommandSpec.class:1.8-1577-4.0.0-BETA-1032]
        at org.spongepowered.api.command.dispatcher.SimpleDispatcher.process(SimpleDispatcher.java:331) ~[SimpleDispatcher.class:1.8-1577-4.0.0-BETA-1032]
        at org.spongepowered.common.command.SpongeCommandManager.process(SpongeCommandManager.java:252) [SpongeCommandManager.class:1.8-1577-4.0.0-BETA-1032]
        at net.minecraft.command.ServerCommandManager.func_71556_a(SourceFile:83) [cl.class:?]
        at net.minecraft.network.NetHandlerPlayServer.func_147361_d(NetHandlerPlayServer.java:812) [rj.class:?]
        at net.minecraft.network.NetHandlerPlayServer.func_147354_a(NetHandlerPlayServer.java:791) [rj.class:?]
        at net.minecraft.network.play.client.C01PacketChatMessage.func_180757_a(SourceFile:37) [lu.class:?]
        at net.minecraft.network.play.client.C01PacketChatMessage.func_148833_a(SourceFile:9) [lu.class:?]
        at net.minecraft.network.PacketThreadUtil$1.onProcessPacket(SourceFile:110) [ih.class:?]
        at net.minecraft.network.PacketThreadUtil$1.run(SourceFile:13) [ih.class:?]
        at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.8.0_77]
        at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_77]
        at net.minecraftforge.fml.common.FMLCommonHandler.callFuture(FMLCommonHandler.java:714) [FMLCommonHandler.class:?]
        at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:656) [MinecraftServer.class:?]
        at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:364) [po.class:?]
        at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:598) [MinecraftServer.class:?]
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:478) [MinecraftServer.class:?]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_77]