[11:22:03 WARN]: java.lang.ClassCastException: com.google.common.collect.RegularImmutableList cannot be cast to [Lorg.bukkit.entity.Player; [11:22:03 WARN]: at com.gmail.filoghost.holographicdisplays.util.VersionUtils.getOnlinePlayers(VersionUtils.java:74) [11:22:03 WARN]: at com.gmail.filoghost.holographicdisplays.placeholder.PlaceholdersRegister$1.update(PlaceholdersRegister.java:28) [11:22:03 WARN]: at com.gmail.filoghost.holographicdisplays.placeholder.Placeholder.update(Placeholder.java:64) [11:22:03 WARN]: at com.gmail.filoghost.holographicdisplays.placeholder.PlaceholdersManager$1.run(PlaceholdersManager.java:51) [11:22:03 WARN]: at org.bukkit.craftbukkit.v1_7_R4.scheduler.CraftTask.run(CraftTask.java:71) [11:22:03 WARN]: at org.bukkit.craftbukkit.v1_7_R4.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:346) [11:22:03 WARN]: at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:873) [11:22:03 WARN]: at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:431) [11:22:03 WARN]: at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:809) [11:22:03 WARN]: at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:669) [11:22:03 WARN]: at java.lang.Thread.run(Thread.java:745)
Holographicdisplays is trying to convert RegularImmutableList into a List<Player>, no idea why would they do that but you can send a bug report
