Bukkit

I installed the plugin and tryed to test it as i always do before doing a config and it came up with a error Also Errors it ingame I tryed looking in the config for anything that could be causing it but nothing this is the errors

Say Hello

[04:32:10 INFO]: Command Successful!

[04:32:10 WARN]: Unexpected exception while parsing console command "Say Hello" org.bukkit.command.CommandException: Unhandled exception executing command 'say' in plugin CustomSay v1.2 at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[spigot-1.12.2.jar:git-Spigot-2086bb0-21d5f75] at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:141) ~[spigot-1.12.2.jar:git-Spigot-2086bb0-21d5f75] at org.bukkit.craftbukkit.v1_12_R1.CraftServer.dispatchCommand(CraftServer.java:648) ~[spigot-1.12.2.jar:git-Spigot-2086bb0-21d5f75] at org.bukkit.craftbukkit.v1_12_R1.CraftServer.dispatchServerCommand(CraftServer.java:634) [spigot-1.12.2.jar:git-Spigot-2086bb0-21d5f75] at net.minecraft.server.v1_12_R1.DedicatedServer.aP(DedicatedServer.java:444) [spigot-1.12.2.jar:git-Spigot-2086bb0-21d5f75] at net.minecraft.server.v1_12_R1.DedicatedServer.D(DedicatedServer.java:407) [spigot-1.12.2.jar:git-Spigot-2086bb0-21d5f75] at net.minecraft.server.v1_12_R1.MinecraftServer.C(MinecraftServer.java:679) [spigot-1.12.2.jar:git-Spigot-2086bb0-21d5f75] at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:577) [spigot-1.12.2.jar:git-Spigot-2086bb0-21d5f75] at java.lang.Thread.run(Thread.java:748) [?:1.8.0_172] Caused by: java.lang.NoSuchMethodError: org.bukkit.Bukkit.getOnlinePlayers()[Lorg/bukkit/entity/Player; at me.paranormalx.plugins.customsay.Main.onCommand(Main.java:50) ~[?:?] at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[spigot-1.12.2.jar:git-Spigot-2086bb0-21d5f75] ... 8 more

Thank you for any help as this seems to be a good plugin if i can get it working using the 1.12.2 ver of Spigot