[09:45:37] [Server thread/WARN]: Unexpected exception while parsing console command "rankup set djt8000 C"
org.bukkit.command.CommandException: Unhandled exception executing command 'rankup' in plugin PrisonRankup v2.7
	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[monkeycraft179.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
	at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:180) ~[monkeycraft179.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
	at org.bukkit.craftbukkit.v1_7_R3.CraftServer.dispatchCommand(CraftServer.java:701) ~[monkeycraft179.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
	at org.bukkit.craftbukkit.v1_7_R3.CraftServer.dispatchServerCommand(CraftServer.java:688) [monkeycraft179.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
	at net.minecraft.server.v1_7_R3.DedicatedServer.aB(DedicatedServer.java:296) [monkeycraft179.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
	at net.minecraft.server.v1_7_R3.DedicatedServer.v(DedicatedServer.java:261) [monkeycraft179.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
	at net.minecraft.server.v1_7_R3.MinecraftServer.u(MinecraftServer.java:558) [monkeycraft179.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
	at net.minecraft.server.v1_7_R3.MinecraftServer.run(MinecraftServer.java:469) [monkeycraft179.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
	at net.minecraft.server.v1_7_R3.ThreadServerApplication.run(SourceFile:628) [monkeycraft179.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
Caused by: java.lang.NoSuchMethodError: org.bukkit.Server.getOnlinePlayers()Ljava/util/Collection;
	at net.craftservers.prisonrankup.Models.PRPlayer.getOfflinePlayer(PRPlayer.java:189) ~[?:?]
	at net.craftservers.prisonrankup.Models.PRPlayer.<init>(PRPlayer.java:70) ~[?:?]
	at net.craftservers.prisonrankup.SubCommands.Set.onCommand(Set.java:37) ~[?:?]
	at net.craftservers.prisonrankup.Models.CommandHandler.onCommand(CommandHandler.java:57) ~[?:?]
	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[monkeycraft179.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
	... 8 more