Bukkit

When ever it is time for the lottery drawing, we get this error in console:

18.04 20:44:56 [Server] INFO at java.lang.Thread.run(Thread.java:745) [?:1.8.0_101]
18.04 20:44:56 [Server] INFO at net.minecraft.server.v1_10_R1.MinecraftServer.run(MinecraftServer.java:639) [patched_1.10.2.jar:git-Paper-916.2]
18.04 20:44:56 [Server] INFO at net.minecraft.server.v1_10_R1.MinecraftServer.C(MinecraftServer.java:740) [patched_1.10.2.jar:git-Paper-916.2]
18.04 20:44:56 [Server] INFO at net.minecraft.server.v1_10_R1.DedicatedServer.D(DedicatedServer.java:404) [patched_1.10.2.jar:git-Paper-916.2]
18.04 20:44:56 [Server] INFO at net.minecraft.server.v1_10_R1.MinecraftServer.D(MinecraftServer.java:798) [patched_1.10.2.jar:git-Paper-916.2]
18.04 20:44:56 [Server] INFO at org.bukkit.craftbukkit.v1_10_R1.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:355) [patched_1.10.2.jar:git-Paper-916.2]
18.04 20:44:56 [Server] INFO at org.bukkit.craftbukkit.v1_10_R1.scheduler.CraftTask.run(CraftTask.java:58) ~[patched_1.10.2.jar:git-Paper-916.2]
18.04 20:44:56 [Server] INFO at net.erbros.lottery.LotteryDraw$1.run(LotteryDraw.java:29) ~[?:?]
18.04 20:44:56 [Server] INFO at net.erbros.lottery.Lottery.lotteryDraw(Lottery.java:164) ~[?:?]
18.04 20:44:56 [Server] INFO at net.erbros.lottery.LotteryGame.getWinner(LotteryGame.java:402) ~[?:?]
18.04 20:44:56 [Server] INFO at net.erbros.lottery.LotteryGame.broadcastMessage(LotteryGame.java:472) ~[?:?]
18.04 20:44:56 [Server] INFO java.lang.NoSuchMethodError: org.bukkit.Server.getOnlinePlayers()[Lorg/bukkit/entity/Player;
18.04 20:44:56 [Server] WARN Task #582538 for Lottery v0.9.4 generated an exception
18.04 20:44:54 [Server] WARN Enabled plugin with unregistered PluginClassLoader Lottery v0.9.4

any idea how to fix this?

As well as sending that through console, it is also repeatedly giving the winner their reward every few seconds!