[19:06:26] [Server thread/ERROR] [Sponge]: The Scheduler tried to run the task ARENA owned by SpongePlugin:Ember{1.0.0}, but an error occured.
java.lang.AbstractMethodError: Method io/github/hsyyid/ultimategames/minigames/DeathmatchMinigame.accept(Ljava/lang/Object;)V is abstract
        at io.github.hsyyid.ultimategames.minigames.DeathmatchMinigame.accept(DeathmatchMinigame.java) ~[DeathmatchMinigame.class:0.1]
        at org.spongepowered.common.service.scheduler.SchedulerBase.lambda$startTask$84(SchedulerBase.java:174) [SchedulerBase.class:1.8-1577-2.1-DEV-851]
        at org.spongepowered.common.service.scheduler.SchedulerBase$$Lambda$154/731982310.run(Unknown Source) [SchedulerBase.class:1.8-1577-2.1-DEV-851]
        at org.spongepowered.common.service.scheduler.SyncScheduler.executeTaskRunnable(SyncScheduler.java:66) [SyncScheduler.class:1.8-1577-2.1-DEV-851]
        at org.spongepowered.common.service.scheduler.SchedulerBase.startTask(SchedulerBase.java:171) [SchedulerBase.class:1.8-1577-2.1-DEV-851]
        at org.spongepowered.common.service.scheduler.SchedulerBase.processTask(SchedulerBase.java:157) [SchedulerBase.class:1.8-1577-2.1-DEV-851]
        at org.spongepowered.common.service.scheduler.SchedulerBase$$Lambda$136/547491388.accept(Unknown Source) [SchedulerBase.class:1.8-1577-2.1-DEV-851]
        at java.util.concurrent.ConcurrentHashMap$ValuesView.forEach(ConcurrentHashMap.java:4707) [?:1.8.0_51]
        at org.spongepowered.common.service.scheduler.SchedulerBase.runTick(SchedulerBase.java:101) [SchedulerBase.class:1.8-1577-2.1-DEV-851]
        at org.spongepowered.common.service.scheduler.SyncScheduler.tick(SyncScheduler.java:41) [SyncScheduler.class:1.8-1577-2.1-DEV-851]
        at org.spongepowered.common.service.scheduler.SpongeScheduler.tickSyncScheduler(SpongeScheduler.java:173) [SpongeScheduler.class:1.8-1577-2.1-DEV-851]
        at org.spongepowered.mod.SpongeMod.onTick(SpongeMod.java:186) [SpongeMod.class:1.8-1577-2.1-DEV-851]
        at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_9_SpongeMod_onTick_ServerTickEvent.invoke(.dynamic) [?:?]
        at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:55) [ASMEventHandler.class:?]
        at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:81) [EventBus.class:?]
        at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:58) [EventBus.class:?]
        at net.minecraftforge.fml.common.FMLCommonHandler.onPreServerTick(FMLCommonHandler.java:301) [FMLCommonHandler.class:?]
        at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:587) [MinecraftServer.class:?]
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:478) [MinecraftServer.class:?]
        at java.lang.Thread.run(Thread.java:745) [?:1.8.0_51]