Hologram error api6

[20:12:00] [Server thread/ERROR] [Sponge]: Error occurred while executing command 'holograms createmultiline 2' for source EntityPlayerMP['comdarksider'/846, l='world', x=41.64, y=64.00, z=285.29]: org.spongepowered.api.world.World.createEntity(Lorg/spongepowered/api/entity/EntityType;Lcom/flowpowered/math/vector/Vector3d;)Ljava/util/Optional;
java.lang.NoSuchMethodError: org.spongepowered.api.world.World.createEntity(Lorg/spongepowered/api/entity/EntityType;Lcom/flowpowered/math/vector/Vector3d;)Ljava/util/Optional;
        at de.randombyte.holograms.Hologram$Companion.spawn(Hologram.kt:24) ~[Hologram$Companion.class:?]
        at de.randombyte.holograms.commands.SpawnMultiLineTextHologramCommand.executedWithPermission(SpawnMultiLineTextHologramCommand.kt:15) ~[SpawnMultiLineTextHologramCommand.class:?]
        at de.randombyte.holograms.commands.PermissionNeededCommandExecutor.executedByPlayer(PermissionNeededCommandExecutor.kt:12) ~[PermissionNeededCommandExecutor.class:?]
        at de.randombyte.holograms.commands.PlayerCommandExecutor.execute(PlayerCommandExecutor.kt:17) ~[PlayerCommandExecutor.class:?]
        at org.spongepowered.api.command.args.ChildCommandElementExecutor.execute(ChildCommandElementExecutor.java:179) ~[ChildCommandElementExecutor.class:1.10.2-2107-6.0.0-BETA-1856]
        at org.spongepowered.api.command.spec.CommandSpec.process(CommandSpec.java:351) ~[CommandSpec.class:1.10.2-2107-6.0.0-BETA-1856]
        at org.spongepowered.api.command.dispatcher.SimpleDispatcher.process(SimpleDispatcher.java:333) ~[SimpleDispatcher.class:1.10.2-2107-6.0.0-BETA-1856]
        at org.spongepowered.common.command.SpongeCommandManager.process(SpongeCommandManager.java:291) [SpongeCommandManager.class:1.10.2-2107-6.0.0-BETA-1856]
        at net.minecraft.command.ServerCommandManager.func_71556_a(SourceFile:82) [bd.class:?]
        at net.minecraft.network.NetHandlerPlayServer.func_147361_d(NetHandlerPlayServer.java:913) [me.class:?]
        at net.minecraft.network.NetHandlerPlayServer.func_147354_a(NetHandlerPlayServer.java:892) [me.class:?]
        at net.minecraft.network.play.client.CPacketChatMessage.func_148833_a(SourceFile:37) [im.class:?]
        at net.minecraft.network.play.client.CPacketChatMessage.func_148833_a(SourceFile:9) [im.class:?]
        at org.spongepowered.common.network.PacketUtil.onProcessPacket(PacketUtil.java:123) [PacketUtil.class:1.10.2-2107-6.0.0-BETA-1856]
        at net.minecraft.network.PacketThreadUtil$1.redirect$onProcessPacket$zjb000(SourceFile:39) [fl$1.class:?]
        at net.minecraft.network.PacketThreadUtil$1.run(SourceFile:13) [fl$1.class:?]
        at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.8.0_101]
        at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_101]
        at net.minecraft.util.Util.func_181617_a(SourceFile:45) [h.class:?]
        at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:668) [MinecraftServer.class:?]
        at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:387) [ld.class:?]
        at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:613) [MinecraftServer.class:?]
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:471) [MinecraftServer.class:?]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_101]