2018-10-18 21:07:58 [WARNING] [JRender] Task #51 for JRender v1.0 generated an exception
java.lang.NoSuchMethodError: org.bukkit.Bukkit.getOnlinePlayers()Ljava/util/Collection;
	at ru.sceri.jrender.JRender.refresh(JRender.java:206)
	at ru.sceri.jrender.JRender.access$000(JRender.java:40)
	at ru.sceri.jrender.JRender$3.run(JRender.java:104)
	at org.bukkit.craftbukkit.v1_6_R3.scheduler.CraftTask.run(CraftTask.java:58)
	at org.bukkit.craftbukkit.v1_6_R3.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:345)
	at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:829)
	at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:261)
	at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:784)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:666)
	at net.minecraft.server.ThreadMinecraftServer.run(SourceFile:583)