EasyScoreboards - 2.1.0

error task to run

[08:36:29] [Server thread/ERROR] [Sponge]: The Scheduler tried to run the task de_yottaflops_easyscoreboard-S-779 owned by Plugin{id=de_yottaflops_easyscoreboard, name=Easy Scoreboards, version=2.1.0, description=A plugin to easily create scoreboards for lobbys, source=D:\For XX\setup\minecraft\Server\testing\Forge 2202 pixelmon\mods\EasyScoreboards-2.1.0.jar}, but an error occured.
java.lang.UnsupportedOperationException
        at com.google.common.collect.ImmutableCollection.add(ImmutableCollection.java:96) ~[minecraft_server.1.10.2.jar:?]
        at de.YottaFLOPS.EasyScoreboard.Main.makeScoreboard(Main.java:240) ~[Main.class:?]
        at de.YottaFLOPS.EasyScoreboard.Main.setScoreboard(Main.java:338) ~[Main.class:?]
        at java.lang.Iterable.forEach(Unknown Source) ~[?:1.8.0_121]
        at de.YottaFLOPS.EasyScoreboard.Main.updateAllScoreboards(Main.java:329) ~[Main.class:?]
        at de.YottaFLOPS.EasyScoreboard.Utils.Runnables.lambda$startPlaceholderTask$2(Runnables.java:85) ~[Runnables.class:?]
        at org.spongepowered.api.scheduler.Task$Builder.lambda$execute$0(Task.java:138) ~[Task$Builder.class:1.10.2-2202-5.1.0-BETA-2099]
        at org.spongepowered.common.scheduler.SchedulerBase.lambda$startTask$0(SchedulerBase.java:183) ~[SchedulerBase.class:1.10.2-2202-5.1.0-BETA-2099]
        at org.spongepowered.common.scheduler.SyncScheduler.executeTaskRunnable(SyncScheduler.java:66) ~[SyncScheduler.class:1.10.2-2202-5.1.0-BETA-2099]
        at org.spongepowered.common.scheduler.SchedulerBase.startTask(SchedulerBase.java:179) ~[SchedulerBase.class:1.10.2-2202-5.1.0-BETA-2099]
        at org.spongepowered.common.scheduler.SchedulerBase.processTask(SchedulerBase.java:165) ~[SchedulerBase.class:1.10.2-2202-5.1.0-BETA-2099]
        at java.util.concurrent.ConcurrentHashMap$ValuesView.forEach(Unknown Source) [?:1.8.0_121]
        at org.spongepowered.common.scheduler.SchedulerBase.runTick(SchedulerBase.java:108) [SchedulerBase.class:1.10.2-2202-5.1.0-BETA-2099]
        at org.spongepowered.common.scheduler.SyncScheduler.tick(SyncScheduler.java:41) [SyncScheduler.class:1.10.2-2202-5.1.0-BETA-2099]
        at org.spongepowered.common.scheduler.SpongeScheduler.tickSyncScheduler(SpongeScheduler.java:191) [SpongeScheduler.class:1.10.2-2202-5.1.0-BETA-2099]
        at org.spongepowered.mod.SpongeMod.onTick(SpongeMod.java:271) [SpongeMod.class:1.10.2-2202-5.1.0-BETA-2099]
        at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_10_SpongeMod_onTick_ServerTickEvent.invoke(.dynamic) [?:?]
        at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:90) [ASMEventHandler.class:?]
        at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:637) [EventBus.class:?]
        at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:593) [EventBus.class:?]
        at net.minecraftforge.fml.common.FMLCommonHandler.onPreServerTick(FMLCommonHandler.java:274) [FMLCommonHandler.class:?]
        at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:602) [MinecraftServer.class:?]
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:471) [MinecraftServer.class:?]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_121]