[23:51:44] [Server thread/ERROR] [Sponge]: Error occurred while executing command 'login 23456' for source EntityPlayerMP['jiangming1399'/169, l='world', x=-22.00, y=75.00, z=-4.00]: org.spongepowered.api.service.scheduler.SchedulerService.createTaskBuilder()Lorg/spongepowered/api/service/scheduler/Task$Builder;
java.lang.NoSuchMethodError: org.spongepowered.api.service.scheduler.SchedulerService.createTaskBuilder()Lorg/spongepowered/api/service/scheduler/Task$Builder;
        at com.github.games647.flexiblelogin.commands.LoginCommand.execute(LoginCommand.java:33) ~[LoginCommand.class:?]
        at org.spongepowered.api.util.command.spec.CommandSpec.process(CommandSpec.java:334) ~[CommandSpec.class:1.8-1561-2.1-DEV-808]
        at org.spongepowered.api.util.command.dispatcher.SimpleDispatcher.process(SimpleDispatcher.java:340) ~[SimpleDispatcher.class:1.8-1561-2.1-DEV-808]
        at org.spongepowered.api.service.command.SimpleCommandService.process(SimpleCommandService.java:250) [SimpleCommandService.class:1.8-1561-2.1-DEV-808]
        at net.minecraft.command.ServerCommandManager.func_71556_a(SourceFile:80) [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:59) [ih.class:?]
        at net.minecraft.network.PacketThreadUtil$1.run(SourceFile:13) [ih.class:?]
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_65]
        at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_65]
        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(Thread.java:745) [?:1.8.0_65]
[23:52:48] [Server thread/ERROR] [Sponge]: Error occurred while executing command 'register 123456 123456' for source EntityPlayerMP['jiangming1399'/169, l='world', x=-22.00, y=75.00, z=-4.00]: org.spongepowered.api.service.scheduler.SchedulerService.createTaskBuilder()Lorg/spongepowered/api/service/scheduler/Task$Builder;
java.lang.NoSuchMethodError: org.spongepowered.api.service.scheduler.SchedulerService.createTaskBuilder()Lorg/spongepowered/api/service/scheduler/Task$Builder;
        at com.github.games647.flexiblelogin.commands.RegisterCommand.startTask(RegisterCommand.java:60) ~[RegisterCommand.class:?]
        at com.github.games647.flexiblelogin.commands.RegisterCommand.execute(RegisterCommand.java:51) ~[RegisterCommand.class:?]
        at org.spongepowered.api.util.command.spec.CommandSpec.process(CommandSpec.java:334) ~[CommandSpec.class:1.8-1561-2.1-DEV-808]
        at org.spongepowered.api.util.command.dispatcher.SimpleDispatcher.process(SimpleDispatcher.java:340) ~[SimpleDispatcher.class:1.8-1561-2.1-DEV-808]
        at org.spongepowered.api.service.command.SimpleCommandService.process(SimpleCommandService.java:250) [SimpleCommandService.class:1.8-1561-2.1-DEV-808]
        at net.minecraft.command.ServerCommandManager.func_71556_a(SourceFile:80) [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:59) [ih.class:?]
        at net.minecraft.network.PacketThreadUtil$1.run(SourceFile:13) [ih.class:?]
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_65]
        at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_65]
        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(Thread.java:745) [?:1.8.0_65]